diff --git a/1000-hours/.vitepress/config.mts b/1000-hours/.vitepress/config.mts
index 829e16a1..91b6240c 100644
--- a/1000-hours/.vitepress/config.mts
+++ b/1000-hours/.vitepress/config.mts
@@ -234,10 +234,6 @@ export default withMermaid(
                         text: "2.2.15. w, j",
                         link: "/sounds-of-american-english/2.2.15-wj",
                       },
-                      {
-                        text: "2.2.16.拼读",
-                        link: "/sounds-of-american-english/2.2.16-spellings",
-                      },
                     ]
                   },
                   {
@@ -318,6 +314,44 @@ export default withMermaid(
                   },
                 ],
               },
+              {
+                text: "4. 而后",
+                collapsed: true,
+                link: "/sounds-of-american-english/4-whats-next",
+                items: [
+                  {
+                    text: "4.1. 多音拼写",
+                    link: "/sounds-of-american-english/4.1-multisounds",
+                  },
+                  {
+                    text: "4.2. 组合词汇",
+                    link: "/sounds-of-american-english/4.2-compounds",
+                  },
+                  {
+                    text: "4.3. 词根词缀",
+                    collapsed: false,
+                    link: "/sounds-of-american-english/4.3-components",
+                    items: [
+                      {
+                        text: "4.3.1. 常见前缀",
+                        link: "/sounds-of-american-english/4.3.1-prefixes",
+                      },
+                      {
+                        text: "4.3.2. 常见后缀",
+                        link: "/sounds-of-american-english/4.3.2-suffixes",
+                      },
+                      {
+                        text: "4.3.3. 常见词根",
+                        link: "/sounds-of-american-english/4.3.3-roots",
+                      },
+                    ],
+                  },
+                ],
+              },
+              {
+                text: "5. 总结",
+                link: "/sounds-of-american-english/5-sumup",
+              },
             ],
           },
           // {
diff --git a/1000-hours/public/audios/us/ability-us-female.mp3 b/1000-hours/public/audios/us/ability-us-female.mp3
new file mode 100644
index 00000000..7ab27961
Binary files /dev/null and b/1000-hours/public/audios/us/ability-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/ability-us-male.mp3 b/1000-hours/public/audios/us/ability-us-male.mp3
new file mode 100644
index 00000000..00f913d9
Binary files /dev/null and b/1000-hours/public/audios/us/ability-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/acceptance-us-female.mp3 b/1000-hours/public/audios/us/acceptance-us-female.mp3
new file mode 100644
index 00000000..4318ab17
Binary files /dev/null and b/1000-hours/public/audios/us/acceptance-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/acceptance-us-male.mp3 b/1000-hours/public/audios/us/acceptance-us-male.mp3
new file mode 100644
index 00000000..5f86bbf0
Binary files /dev/null and b/1000-hours/public/audios/us/acceptance-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/active-us-female.mp3 b/1000-hours/public/audios/us/active-us-female.mp3
new file mode 100644
index 00000000..1e816306
Binary files /dev/null and b/1000-hours/public/audios/us/active-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/active-us-male.mp3 b/1000-hours/public/audios/us/active-us-male.mp3
new file mode 100644
index 00000000..141228e6
Binary files /dev/null and b/1000-hours/public/audios/us/active-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/admission-us-female.mp3 b/1000-hours/public/audios/us/admission-us-female.mp3
new file mode 100644
index 00000000..c406aece
Binary files /dev/null and b/1000-hours/public/audios/us/admission-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/admission-us-male.mp3 b/1000-hours/public/audios/us/admission-us-male.mp3
new file mode 100644
index 00000000..1a25cb58
Binary files /dev/null and b/1000-hours/public/audios/us/admission-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/admit-us-female.mp3 b/1000-hours/public/audios/us/admit-us-female.mp3
new file mode 100644
index 00000000..3bf829b3
Binary files /dev/null and b/1000-hours/public/audios/us/admit-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/admit-us-male.mp3 b/1000-hours/public/audios/us/admit-us-male.mp3
new file mode 100644
index 00000000..38a80fd6
Binary files /dev/null and b/1000-hours/public/audios/us/admit-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/agreement-us-female.mp3 b/1000-hours/public/audios/us/agreement-us-female.mp3
new file mode 100644
index 00000000..6365c313
Binary files /dev/null and b/1000-hours/public/audios/us/agreement-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/agreement-us-male.mp3 b/1000-hours/public/audios/us/agreement-us-male.mp3
new file mode 100644
index 00000000..5a0b8aee
Binary files /dev/null and b/1000-hours/public/audios/us/agreement-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/airplane-us-female.mp3 b/1000-hours/public/audios/us/airplane-us-female.mp3
new file mode 100644
index 00000000..8098eb0a
Binary files /dev/null and b/1000-hours/public/audios/us/airplane-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/airplane-us-male.mp3 b/1000-hours/public/audios/us/airplane-us-male.mp3
new file mode 100644
index 00000000..df685846
Binary files /dev/null and b/1000-hours/public/audios/us/airplane-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/airport-us-female.mp3 b/1000-hours/public/audios/us/airport-us-female.mp3
new file mode 100644
index 00000000..152657b1
Binary files /dev/null and b/1000-hours/public/audios/us/airport-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/airport-us-male.mp3 b/1000-hours/public/audios/us/airport-us-male.mp3
new file mode 100644
index 00000000..dc508174
Binary files /dev/null and b/1000-hours/public/audios/us/airport-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/antibiotic-us-female.mp3 b/1000-hours/public/audios/us/antibiotic-us-female.mp3
new file mode 100644
index 00000000..ce284be0
Binary files /dev/null and b/1000-hours/public/audios/us/antibiotic-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/antibiotic-us-male.mp3 b/1000-hours/public/audios/us/antibiotic-us-male.mp3
new file mode 100644
index 00000000..33396fd9
Binary files /dev/null and b/1000-hours/public/audios/us/antibiotic-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/antifreeze-us-female.mp3 b/1000-hours/public/audios/us/antifreeze-us-female.mp3
new file mode 100644
index 00000000..0a8fa79e
Binary files /dev/null and b/1000-hours/public/audios/us/antifreeze-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/antifreeze-us-male.mp3 b/1000-hours/public/audios/us/antifreeze-us-male.mp3
new file mode 100644
index 00000000..8a6f3fb8
Binary files /dev/null and b/1000-hours/public/audios/us/antifreeze-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/antisocial-us-female.mp3 b/1000-hours/public/audios/us/antisocial-us-female.mp3
new file mode 100644
index 00000000..eb492147
Binary files /dev/null and b/1000-hours/public/audios/us/antisocial-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/antisocial-us-male.mp3 b/1000-hours/public/audios/us/antisocial-us-male.mp3
new file mode 100644
index 00000000..13ebe865
Binary files /dev/null and b/1000-hours/public/audios/us/antisocial-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/apple-us-female.mp3 b/1000-hours/public/audios/us/apple-us-female.mp3
index a64e1b3f..c760f131 100644
Binary files a/1000-hours/public/audios/us/apple-us-female.mp3 and b/1000-hours/public/audios/us/apple-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/apple-us-male.mp3 b/1000-hours/public/audios/us/apple-us-male.mp3
index c18b87de..1347b405 100644
Binary files a/1000-hours/public/audios/us/apple-us-male.mp3 and b/1000-hours/public/audios/us/apple-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/aquarium-us-female.mp3 b/1000-hours/public/audios/us/aquarium-us-female.mp3
new file mode 100644
index 00000000..c9d25a91
Binary files /dev/null and b/1000-hours/public/audios/us/aquarium-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/aquarium-us-male.mp3 b/1000-hours/public/audios/us/aquarium-us-male.mp3
new file mode 100644
index 00000000..b93308f6
Binary files /dev/null and b/1000-hours/public/audios/us/aquarium-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/aquatic-us-female.mp3 b/1000-hours/public/audios/us/aquatic-us-female.mp3
new file mode 100644
index 00000000..2c343742
Binary files /dev/null and b/1000-hours/public/audios/us/aquatic-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/aquatic-us-male.mp3 b/1000-hours/public/audios/us/aquatic-us-male.mp3
new file mode 100644
index 00000000..08aa0210
Binary files /dev/null and b/1000-hours/public/audios/us/aquatic-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/aqueduct-us-female.mp3 b/1000-hours/public/audios/us/aqueduct-us-female.mp3
new file mode 100644
index 00000000..95022be6
Binary files /dev/null and b/1000-hours/public/audios/us/aqueduct-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/aqueduct-us-male.mp3 b/1000-hours/public/audios/us/aqueduct-us-male.mp3
new file mode 100644
index 00000000..128734ff
Binary files /dev/null and b/1000-hours/public/audios/us/aqueduct-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/artist-us-female.mp3 b/1000-hours/public/audios/us/artist-us-female.mp3
new file mode 100644
index 00000000..dfbc8444
Binary files /dev/null and b/1000-hours/public/audios/us/artist-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/artist-us-male.mp3 b/1000-hours/public/audios/us/artist-us-male.mp3
new file mode 100644
index 00000000..df566545
Binary files /dev/null and b/1000-hours/public/audios/us/artist-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/artistic-us-female.mp3 b/1000-hours/public/audios/us/artistic-us-female.mp3
new file mode 100644
index 00000000..1ce8a399
Binary files /dev/null and b/1000-hours/public/audios/us/artistic-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/artistic-us-male.mp3 b/1000-hours/public/audios/us/artistic-us-male.mp3
new file mode 100644
index 00000000..d8da166b
Binary files /dev/null and b/1000-hours/public/audios/us/artistic-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/athletic-us-female.mp3 b/1000-hours/public/audios/us/athletic-us-female.mp3
new file mode 100644
index 00000000..164eb820
Binary files /dev/null and b/1000-hours/public/audios/us/athletic-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/athletic-us-male.mp3 b/1000-hours/public/audios/us/athletic-us-male.mp3
new file mode 100644
index 00000000..24a737c7
Binary files /dev/null and b/1000-hours/public/audios/us/athletic-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/attractive-us-female.mp3 b/1000-hours/public/audios/us/attractive-us-female.mp3
new file mode 100644
index 00000000..b8235790
Binary files /dev/null and b/1000-hours/public/audios/us/attractive-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/attractive-us-male.mp3 b/1000-hours/public/audios/us/attractive-us-male.mp3
new file mode 100644
index 00000000..83f1b730
Binary files /dev/null and b/1000-hours/public/audios/us/attractive-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/audience-us-female.mp3 b/1000-hours/public/audios/us/audience-us-female.mp3
new file mode 100644
index 00000000..6eed7919
Binary files /dev/null and b/1000-hours/public/audios/us/audience-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/audience-us-male.mp3 b/1000-hours/public/audios/us/audience-us-male.mp3
new file mode 100644
index 00000000..d533e0c0
Binary files /dev/null and b/1000-hours/public/audios/us/audience-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/audio-us-female.mp3 b/1000-hours/public/audios/us/audio-us-female.mp3
new file mode 100644
index 00000000..3b45960e
Binary files /dev/null and b/1000-hours/public/audios/us/audio-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/audio-us-male.mp3 b/1000-hours/public/audios/us/audio-us-male.mp3
new file mode 100644
index 00000000..8e0175a1
Binary files /dev/null and b/1000-hours/public/audios/us/audio-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/audition-us-female.mp3 b/1000-hours/public/audios/us/audition-us-female.mp3
new file mode 100644
index 00000000..6886d855
Binary files /dev/null and b/1000-hours/public/audios/us/audition-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/audition-us-male.mp3 b/1000-hours/public/audios/us/audition-us-male.mp3
new file mode 100644
index 00000000..3b03c341
Binary files /dev/null and b/1000-hours/public/audios/us/audition-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/backyard-us-female.mp3 b/1000-hours/public/audios/us/backyard-us-female.mp3
new file mode 100644
index 00000000..e514bce5
Binary files /dev/null and b/1000-hours/public/audios/us/backyard-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/backyard-us-male.mp3 b/1000-hours/public/audios/us/backyard-us-male.mp3
new file mode 100644
index 00000000..8d057f2d
Binary files /dev/null and b/1000-hours/public/audios/us/backyard-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/bedroom-us-female.mp3 b/1000-hours/public/audios/us/bedroom-us-female.mp3
new file mode 100644
index 00000000..56862e6c
Binary files /dev/null and b/1000-hours/public/audios/us/bedroom-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/bedroom-us-male.mp3 b/1000-hours/public/audios/us/bedroom-us-male.mp3
new file mode 100644
index 00000000..463c6d59
Binary files /dev/null and b/1000-hours/public/audios/us/bedroom-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/benefactor-us-female.mp3 b/1000-hours/public/audios/us/benefactor-us-female.mp3
new file mode 100644
index 00000000..b0e42a5f
Binary files /dev/null and b/1000-hours/public/audios/us/benefactor-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/benefactor-us-male.mp3 b/1000-hours/public/audios/us/benefactor-us-male.mp3
new file mode 100644
index 00000000..8157b4fa
Binary files /dev/null and b/1000-hours/public/audios/us/benefactor-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/benefit-us-female.mp3 b/1000-hours/public/audios/us/benefit-us-female.mp3
new file mode 100644
index 00000000..3547a4cc
Binary files /dev/null and b/1000-hours/public/audios/us/benefit-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/benefit-us-male.mp3 b/1000-hours/public/audios/us/benefit-us-male.mp3
new file mode 100644
index 00000000..72d84640
Binary files /dev/null and b/1000-hours/public/audios/us/benefit-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/benevolent-us-female.mp3 b/1000-hours/public/audios/us/benevolent-us-female.mp3
new file mode 100644
index 00000000..5981c0d1
Binary files /dev/null and b/1000-hours/public/audios/us/benevolent-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/benevolent-us-male.mp3 b/1000-hours/public/audios/us/benevolent-us-male.mp3
new file mode 100644
index 00000000..4684c3d1
Binary files /dev/null and b/1000-hours/public/audios/us/benevolent-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/birthday-us-female.mp3 b/1000-hours/public/audios/us/birthday-us-female.mp3
new file mode 100644
index 00000000..af5c58ac
Binary files /dev/null and b/1000-hours/public/audios/us/birthday-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/birthday-us-male.mp3 b/1000-hours/public/audios/us/birthday-us-male.mp3
new file mode 100644
index 00000000..f813a91b
Binary files /dev/null and b/1000-hours/public/audios/us/birthday-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/blackboard-us-female.mp3 b/1000-hours/public/audios/us/blackboard-us-female.mp3
new file mode 100644
index 00000000..b61797b1
Binary files /dev/null and b/1000-hours/public/audios/us/blackboard-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/blackboard-us-male.mp3 b/1000-hours/public/audios/us/blackboard-us-male.mp3
new file mode 100644
index 00000000..0ba4efd0
Binary files /dev/null and b/1000-hours/public/audios/us/blackboard-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/bookstore-us-female.mp3 b/1000-hours/public/audios/us/bookstore-us-female.mp3
new file mode 100644
index 00000000..edc34650
Binary files /dev/null and b/1000-hours/public/audios/us/bookstore-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/bookstore-us-male.mp3 b/1000-hours/public/audios/us/bookstore-us-male.mp3
new file mode 100644
index 00000000..55a00ba0
Binary files /dev/null and b/1000-hours/public/audios/us/bookstore-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/brainstorm-us-female.mp3 b/1000-hours/public/audios/us/brainstorm-us-female.mp3
new file mode 100644
index 00000000..0ac0fca4
Binary files /dev/null and b/1000-hours/public/audios/us/brainstorm-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/brainstorm-us-male.mp3 b/1000-hours/public/audios/us/brainstorm-us-male.mp3
new file mode 100644
index 00000000..1f7488aa
Binary files /dev/null and b/1000-hours/public/audios/us/brainstorm-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/breakfast-us-female.mp3 b/1000-hours/public/audios/us/breakfast-us-female.mp3
new file mode 100644
index 00000000..bc72652f
Binary files /dev/null and b/1000-hours/public/audios/us/breakfast-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/breakfast-us-male.mp3 b/1000-hours/public/audios/us/breakfast-us-male.mp3
new file mode 100644
index 00000000..8a67c2b1
Binary files /dev/null and b/1000-hours/public/audios/us/breakfast-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/careful-us-female.mp3 b/1000-hours/public/audios/us/careful-us-female.mp3
new file mode 100644
index 00000000..98b9e308
Binary files /dev/null and b/1000-hours/public/audios/us/careful-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/careful-us-male.mp3 b/1000-hours/public/audios/us/careful-us-male.mp3
new file mode 100644
index 00000000..68a84d53
Binary files /dev/null and b/1000-hours/public/audios/us/careful-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/celebration-us-female.mp3 b/1000-hours/public/audios/us/celebration-us-female.mp3
index 1169c29d..f9440c89 100644
Binary files a/1000-hours/public/audios/us/celebration-us-female.mp3 and b/1000-hours/public/audios/us/celebration-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/celebration-us-male.mp3 b/1000-hours/public/audios/us/celebration-us-male.mp3
index 4c329691..1e0a1da9 100644
Binary files a/1000-hours/public/audios/us/celebration-us-male.mp3 and b/1000-hours/public/audios/us/celebration-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/centennial-us-female.mp3 b/1000-hours/public/audios/us/centennial-us-female.mp3
new file mode 100644
index 00000000..c1fea423
Binary files /dev/null and b/1000-hours/public/audios/us/centennial-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/centennial-us-male.mp3 b/1000-hours/public/audios/us/centennial-us-male.mp3
new file mode 100644
index 00000000..a1927056
Binary files /dev/null and b/1000-hours/public/audios/us/centennial-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/century-us-female.mp3 b/1000-hours/public/audios/us/century-us-female.mp3
new file mode 100644
index 00000000..3ff008c3
Binary files /dev/null and b/1000-hours/public/audios/us/century-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/century-us-male.mp3 b/1000-hours/public/audios/us/century-us-male.mp3
new file mode 100644
index 00000000..ba0ca320
Binary files /dev/null and b/1000-hours/public/audios/us/century-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/classroom-us-female.mp3 b/1000-hours/public/audios/us/classroom-us-female.mp3
new file mode 100644
index 00000000..904ca3cd
Binary files /dev/null and b/1000-hours/public/audios/us/classroom-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/classroom-us-male.mp3 b/1000-hours/public/audios/us/classroom-us-male.mp3
new file mode 100644
index 00000000..e2b97588
Binary files /dev/null and b/1000-hours/public/audios/us/classroom-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/comfortable-us-female.mp3 b/1000-hours/public/audios/us/comfortable-us-female.mp3
new file mode 100644
index 00000000..95af9ce4
Binary files /dev/null and b/1000-hours/public/audios/us/comfortable-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/comfortable-us-male.mp3 b/1000-hours/public/audios/us/comfortable-us-male.mp3
new file mode 100644
index 00000000..3bdf5e7b
Binary files /dev/null and b/1000-hours/public/audios/us/comfortable-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/conduct-us-female.mp3 b/1000-hours/public/audios/us/conduct-us-female.mp3
new file mode 100644
index 00000000..9def4369
Binary files /dev/null and b/1000-hours/public/audios/us/conduct-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/conduct-us-male.mp3 b/1000-hours/public/audios/us/conduct-us-male.mp3
new file mode 100644
index 00000000..6e00a1c5
Binary files /dev/null and b/1000-hours/public/audios/us/conduct-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/conductor-us-female.mp3 b/1000-hours/public/audios/us/conductor-us-female.mp3
new file mode 100644
index 00000000..42f69f26
Binary files /dev/null and b/1000-hours/public/audios/us/conductor-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/conductor-us-male.mp3 b/1000-hours/public/audios/us/conductor-us-male.mp3
new file mode 100644
index 00000000..8714805c
Binary files /dev/null and b/1000-hours/public/audios/us/conductor-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/confusion-us-female.mp3 b/1000-hours/public/audios/us/confusion-us-female.mp3
new file mode 100644
index 00000000..f6ed520a
Binary files /dev/null and b/1000-hours/public/audios/us/confusion-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/confusion-us-male.mp3 b/1000-hours/public/audios/us/confusion-us-male.mp3
new file mode 100644
index 00000000..b55879b7
Binary files /dev/null and b/1000-hours/public/audios/us/confusion-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/consent-us-female.mp3 b/1000-hours/public/audios/us/consent-us-female.mp3
new file mode 100644
index 00000000..ed35e37a
Binary files /dev/null and b/1000-hours/public/audios/us/consent-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/consent-us-male.mp3 b/1000-hours/public/audios/us/consent-us-male.mp3
new file mode 100644
index 00000000..94454838
Binary files /dev/null and b/1000-hours/public/audios/us/consent-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/construct-us-female.mp3 b/1000-hours/public/audios/us/construct-us-female.mp3
new file mode 100644
index 00000000..d89dd10a
Binary files /dev/null and b/1000-hours/public/audios/us/construct-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/construct-us-male.mp3 b/1000-hours/public/audios/us/construct-us-male.mp3
new file mode 100644
index 00000000..53839471
Binary files /dev/null and b/1000-hours/public/audios/us/construct-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/creation-us-female.mp3 b/1000-hours/public/audios/us/creation-us-female.mp3
new file mode 100644
index 00000000..0708351d
Binary files /dev/null and b/1000-hours/public/audios/us/creation-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/creation-us-male.mp3 b/1000-hours/public/audios/us/creation-us-male.mp3
new file mode 100644
index 00000000..5d8492a2
Binary files /dev/null and b/1000-hours/public/audios/us/creation-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/creative-us-female.mp3 b/1000-hours/public/audios/us/creative-us-female.mp3
new file mode 100644
index 00000000..ad51ad8f
Binary files /dev/null and b/1000-hours/public/audios/us/creative-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/creative-us-male.mp3 b/1000-hours/public/audios/us/creative-us-male.mp3
new file mode 100644
index 00000000..0af7ce42
Binary files /dev/null and b/1000-hours/public/audios/us/creative-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/cupcake-us-female.mp3 b/1000-hours/public/audios/us/cupcake-us-female.mp3
new file mode 100644
index 00000000..bb9af952
Binary files /dev/null and b/1000-hours/public/audios/us/cupcake-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/cupcake-us-male.mp3 b/1000-hours/public/audios/us/cupcake-us-male.mp3
new file mode 100644
index 00000000..37ee5781
Binary files /dev/null and b/1000-hours/public/audios/us/cupcake-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/dangerous-us-female.mp3 b/1000-hours/public/audios/us/dangerous-us-female.mp3
new file mode 100644
index 00000000..7b99f873
Binary files /dev/null and b/1000-hours/public/audios/us/dangerous-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/dangerous-us-male.mp3 b/1000-hours/public/audios/us/dangerous-us-male.mp3
new file mode 100644
index 00000000..964d5a9a
Binary files /dev/null and b/1000-hours/public/audios/us/dangerous-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/darkness-us-female.mp3 b/1000-hours/public/audios/us/darkness-us-female.mp3
new file mode 100644
index 00000000..bd448011
Binary files /dev/null and b/1000-hours/public/audios/us/darkness-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/darkness-us-male.mp3 b/1000-hours/public/audios/us/darkness-us-male.mp3
new file mode 100644
index 00000000..9d234cac
Binary files /dev/null and b/1000-hours/public/audios/us/darkness-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/daydream-us-female.mp3 b/1000-hours/public/audios/us/daydream-us-female.mp3
new file mode 100644
index 00000000..6fea2b66
Binary files /dev/null and b/1000-hours/public/audios/us/daydream-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/daydream-us-male.mp3 b/1000-hours/public/audios/us/daydream-us-male.mp3
new file mode 100644
index 00000000..84d78832
Binary files /dev/null and b/1000-hours/public/audios/us/daydream-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/decode-us-female.mp3 b/1000-hours/public/audios/us/decode-us-female.mp3
new file mode 100644
index 00000000..2587249f
Binary files /dev/null and b/1000-hours/public/audios/us/decode-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/decode-us-male.mp3 b/1000-hours/public/audios/us/decode-us-male.mp3
new file mode 100644
index 00000000..2d4755a5
Binary files /dev/null and b/1000-hours/public/audios/us/decode-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/defrost-us-female.mp3 b/1000-hours/public/audios/us/defrost-us-female.mp3
new file mode 100644
index 00000000..8d997e56
Binary files /dev/null and b/1000-hours/public/audios/us/defrost-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/defrost-us-male.mp3 b/1000-hours/public/audios/us/defrost-us-male.mp3
new file mode 100644
index 00000000..b082f4b1
Binary files /dev/null and b/1000-hours/public/audios/us/defrost-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/depend-us-female.mp3 b/1000-hours/public/audios/us/depend-us-female.mp3
new file mode 100644
index 00000000..1081456c
Binary files /dev/null and b/1000-hours/public/audios/us/depend-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/depend-us-male.mp3 b/1000-hours/public/audios/us/depend-us-male.mp3
new file mode 100644
index 00000000..53d7aa28
Binary files /dev/null and b/1000-hours/public/audios/us/depend-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/describe-us-female.mp3 b/1000-hours/public/audios/us/describe-us-female.mp3
new file mode 100644
index 00000000..38fd7671
Binary files /dev/null and b/1000-hours/public/audios/us/describe-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/describe-us-male.mp3 b/1000-hours/public/audios/us/describe-us-male.mp3
new file mode 100644
index 00000000..eb6fb1a9
Binary files /dev/null and b/1000-hours/public/audios/us/describe-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/destruct-us-female.mp3 b/1000-hours/public/audios/us/destruct-us-female.mp3
new file mode 100644
index 00000000..3eef7ae4
Binary files /dev/null and b/1000-hours/public/audios/us/destruct-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/destruct-us-male.mp3 b/1000-hours/public/audios/us/destruct-us-male.mp3
new file mode 100644
index 00000000..a09ce1dc
Binary files /dev/null and b/1000-hours/public/audios/us/destruct-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/devalue-us-female.mp3 b/1000-hours/public/audios/us/devalue-us-female.mp3
new file mode 100644
index 00000000..515ba3c1
Binary files /dev/null and b/1000-hours/public/audios/us/devalue-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/devalue-us-male.mp3 b/1000-hours/public/audios/us/devalue-us-male.mp3
new file mode 100644
index 00000000..14e0cf47
Binary files /dev/null and b/1000-hours/public/audios/us/devalue-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/development-us-female.mp3 b/1000-hours/public/audios/us/development-us-female.mp3
new file mode 100644
index 00000000..01529659
Binary files /dev/null and b/1000-hours/public/audios/us/development-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/development-us-male.mp3 b/1000-hours/public/audios/us/development-us-male.mp3
new file mode 100644
index 00000000..121ca6fe
Binary files /dev/null and b/1000-hours/public/audios/us/development-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/dictate-us-female.mp3 b/1000-hours/public/audios/us/dictate-us-female.mp3
new file mode 100644
index 00000000..82784a8b
Binary files /dev/null and b/1000-hours/public/audios/us/dictate-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/dictate-us-male.mp3 b/1000-hours/public/audios/us/dictate-us-male.mp3
new file mode 100644
index 00000000..c6d9479d
Binary files /dev/null and b/1000-hours/public/audios/us/dictate-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/dictionary-us-female.mp3 b/1000-hours/public/audios/us/dictionary-us-female.mp3
new file mode 100644
index 00000000..bc584ef6
Binary files /dev/null and b/1000-hours/public/audios/us/dictionary-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/dictionary-us-male.mp3 b/1000-hours/public/audios/us/dictionary-us-male.mp3
new file mode 100644
index 00000000..44242aa9
Binary files /dev/null and b/1000-hours/public/audios/us/dictionary-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/difference-us-female.mp3 b/1000-hours/public/audios/us/difference-us-female.mp3
new file mode 100644
index 00000000..5828bcef
Binary files /dev/null and b/1000-hours/public/audios/us/difference-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/difference-us-male.mp3 b/1000-hours/public/audios/us/difference-us-male.mp3
new file mode 100644
index 00000000..c1beb9c7
Binary files /dev/null and b/1000-hours/public/audios/us/difference-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/disagree-us-female.mp3 b/1000-hours/public/audios/us/disagree-us-female.mp3
new file mode 100644
index 00000000..6a0a355e
Binary files /dev/null and b/1000-hours/public/audios/us/disagree-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/disagree-us-male.mp3 b/1000-hours/public/audios/us/disagree-us-male.mp3
new file mode 100644
index 00000000..68ca058a
Binary files /dev/null and b/1000-hours/public/audios/us/disagree-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/disappear-us-female.mp3 b/1000-hours/public/audios/us/disappear-us-female.mp3
new file mode 100644
index 00000000..91ff8487
Binary files /dev/null and b/1000-hours/public/audios/us/disappear-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/disappear-us-male.mp3 b/1000-hours/public/audios/us/disappear-us-male.mp3
new file mode 100644
index 00000000..2dc9b9e3
Binary files /dev/null and b/1000-hours/public/audios/us/disappear-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/disconnect-us-female.mp3 b/1000-hours/public/audios/us/disconnect-us-female.mp3
new file mode 100644
index 00000000..8d15a678
Binary files /dev/null and b/1000-hours/public/audios/us/disconnect-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/disconnect-us-male.mp3 b/1000-hours/public/audios/us/disconnect-us-male.mp3
new file mode 100644
index 00000000..e77a9abe
Binary files /dev/null and b/1000-hours/public/audios/us/disconnect-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/dishwasher-us-female.mp3 b/1000-hours/public/audios/us/dishwasher-us-female.mp3
new file mode 100644
index 00000000..3af56131
Binary files /dev/null and b/1000-hours/public/audios/us/dishwasher-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/dishwasher-us-male.mp3 b/1000-hours/public/audios/us/dishwasher-us-male.mp3
new file mode 100644
index 00000000..818d006e
Binary files /dev/null and b/1000-hours/public/audios/us/dishwasher-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/dissect-us-female.mp3 b/1000-hours/public/audios/us/dissect-us-female.mp3
new file mode 100644
index 00000000..8eca4698
Binary files /dev/null and b/1000-hours/public/audios/us/dissect-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/dissect-us-male.mp3 b/1000-hours/public/audios/us/dissect-us-male.mp3
new file mode 100644
index 00000000..3bf8deb3
Binary files /dev/null and b/1000-hours/public/audios/us/dissect-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/doorbell-us-female.mp3 b/1000-hours/public/audios/us/doorbell-us-female.mp3
new file mode 100644
index 00000000..30c0154e
Binary files /dev/null and b/1000-hours/public/audios/us/doorbell-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/doorbell-us-male.mp3 b/1000-hours/public/audios/us/doorbell-us-male.mp3
new file mode 100644
index 00000000..f47ee618
Binary files /dev/null and b/1000-hours/public/audios/us/doorbell-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/double-us-female.mp3 b/1000-hours/public/audios/us/double-us-female.mp3
index d5ce65a8..743c5119 100644
Binary files a/1000-hours/public/audios/us/double-us-female.mp3 and b/1000-hours/public/audios/us/double-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/double-us-male.mp3 b/1000-hours/public/audios/us/double-us-male.mp3
index 28e2ffd9..6aef71a4 100644
Binary files a/1000-hours/public/audios/us/double-us-male.mp3 and b/1000-hours/public/audios/us/double-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/downtown-us-female.mp3 b/1000-hours/public/audios/us/downtown-us-female.mp3
new file mode 100644
index 00000000..13ce48d7
Binary files /dev/null and b/1000-hours/public/audios/us/downtown-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/downtown-us-male.mp3 b/1000-hours/public/audios/us/downtown-us-male.mp3
new file mode 100644
index 00000000..c0f4eee7
Binary files /dev/null and b/1000-hours/public/audios/us/downtown-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/earthquake-us-female.mp3 b/1000-hours/public/audios/us/earthquake-us-female.mp3
new file mode 100644
index 00000000..92249f4a
Binary files /dev/null and b/1000-hours/public/audios/us/earthquake-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/earthquake-us-male.mp3 b/1000-hours/public/audios/us/earthquake-us-male.mp3
new file mode 100644
index 00000000..ceba0d82
Binary files /dev/null and b/1000-hours/public/audios/us/earthquake-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/edible-us-female.mp3 b/1000-hours/public/audios/us/edible-us-female.mp3
new file mode 100644
index 00000000..6f953d84
Binary files /dev/null and b/1000-hours/public/audios/us/edible-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/edible-us-male.mp3 b/1000-hours/public/audios/us/edible-us-male.mp3
new file mode 100644
index 00000000..6852cdc8
Binary files /dev/null and b/1000-hours/public/audios/us/edible-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/education-us-female.mp3 b/1000-hours/public/audios/us/education-us-female.mp3
new file mode 100644
index 00000000..9397aacb
Binary files /dev/null and b/1000-hours/public/audios/us/education-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/education-us-male.mp3 b/1000-hours/public/audios/us/education-us-male.mp3
new file mode 100644
index 00000000..5076e8ff
Binary files /dev/null and b/1000-hours/public/audios/us/education-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/embrace-us-female.mp3 b/1000-hours/public/audios/us/embrace-us-female.mp3
new file mode 100644
index 00000000..4011157d
Binary files /dev/null and b/1000-hours/public/audios/us/embrace-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/embrace-us-male.mp3 b/1000-hours/public/audios/us/embrace-us-male.mp3
new file mode 100644
index 00000000..c390a1f0
Binary files /dev/null and b/1000-hours/public/audios/us/embrace-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/employ-us-female.mp3 b/1000-hours/public/audios/us/employ-us-female.mp3
new file mode 100644
index 00000000..cf604d7b
Binary files /dev/null and b/1000-hours/public/audios/us/employ-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/employ-us-male.mp3 b/1000-hours/public/audios/us/employ-us-male.mp3
new file mode 100644
index 00000000..d3a63dc5
Binary files /dev/null and b/1000-hours/public/audios/us/employ-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/empower-us-female.mp3 b/1000-hours/public/audios/us/empower-us-female.mp3
new file mode 100644
index 00000000..4b8833e8
Binary files /dev/null and b/1000-hours/public/audios/us/empower-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/empower-us-male.mp3 b/1000-hours/public/audios/us/empower-us-male.mp3
new file mode 100644
index 00000000..2661bd1d
Binary files /dev/null and b/1000-hours/public/audios/us/empower-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/enable-us-female.mp3 b/1000-hours/public/audios/us/enable-us-female.mp3
new file mode 100644
index 00000000..273219fd
Binary files /dev/null and b/1000-hours/public/audios/us/enable-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/enable-us-male.mp3 b/1000-hours/public/audios/us/enable-us-male.mp3
new file mode 100644
index 00000000..6ee71df7
Binary files /dev/null and b/1000-hours/public/audios/us/enable-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/encourage-us-female.mp3 b/1000-hours/public/audios/us/encourage-us-female.mp3
index 084c7d6b..7ab9a2ba 100644
Binary files a/1000-hours/public/audios/us/encourage-us-female.mp3 and b/1000-hours/public/audios/us/encourage-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/encourage-us-male.mp3 b/1000-hours/public/audios/us/encourage-us-male.mp3
index 13397075..e47ee001 100644
Binary files a/1000-hours/public/audios/us/encourage-us-male.mp3 and b/1000-hours/public/audios/us/encourage-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/endless-us-female.mp3 b/1000-hours/public/audios/us/endless-us-female.mp3
new file mode 100644
index 00000000..d5d67159
Binary files /dev/null and b/1000-hours/public/audios/us/endless-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/endless-us-male.mp3 b/1000-hours/public/audios/us/endless-us-male.mp3
new file mode 100644
index 00000000..0ac47781
Binary files /dev/null and b/1000-hours/public/audios/us/endless-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/energetic-us-female.mp3 b/1000-hours/public/audios/us/energetic-us-female.mp3
new file mode 100644
index 00000000..cabe4990
Binary files /dev/null and b/1000-hours/public/audios/us/energetic-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/energetic-us-male.mp3 b/1000-hours/public/audios/us/energetic-us-male.mp3
new file mode 100644
index 00000000..36bcba68
Binary files /dev/null and b/1000-hours/public/audios/us/energetic-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/enrich-us-female.mp3 b/1000-hours/public/audios/us/enrich-us-female.mp3
new file mode 100644
index 00000000..180635ed
Binary files /dev/null and b/1000-hours/public/audios/us/enrich-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/enrich-us-male.mp3 b/1000-hours/public/audios/us/enrich-us-male.mp3
new file mode 100644
index 00000000..65bcbd43
Binary files /dev/null and b/1000-hours/public/audios/us/enrich-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/evacuate-us-female.mp3 b/1000-hours/public/audios/us/evacuate-us-female.mp3
new file mode 100644
index 00000000..cd8ed28e
Binary files /dev/null and b/1000-hours/public/audios/us/evacuate-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/evacuate-us-male.mp3 b/1000-hours/public/audios/us/evacuate-us-male.mp3
new file mode 100644
index 00000000..c5a03abf
Binary files /dev/null and b/1000-hours/public/audios/us/evacuate-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/everyday-us-female.mp3 b/1000-hours/public/audios/us/everyday-us-female.mp3
new file mode 100644
index 00000000..4021a043
Binary files /dev/null and b/1000-hours/public/audios/us/everyday-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/everyday-us-male.mp3 b/1000-hours/public/audios/us/everyday-us-male.mp3
new file mode 100644
index 00000000..bc4c4f16
Binary files /dev/null and b/1000-hours/public/audios/us/everyday-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/existence-us-female.mp3 b/1000-hours/public/audios/us/existence-us-female.mp3
new file mode 100644
index 00000000..1103c96b
Binary files /dev/null and b/1000-hours/public/audios/us/existence-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/existence-us-male.mp3 b/1000-hours/public/audios/us/existence-us-male.mp3
new file mode 100644
index 00000000..4558ae62
Binary files /dev/null and b/1000-hours/public/audios/us/existence-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/export-us-female.mp3 b/1000-hours/public/audios/us/export-us-female.mp3
new file mode 100644
index 00000000..f909301a
Binary files /dev/null and b/1000-hours/public/audios/us/export-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/export-us-male.mp3 b/1000-hours/public/audios/us/export-us-male.mp3
new file mode 100644
index 00000000..09cf4aa8
Binary files /dev/null and b/1000-hours/public/audios/us/export-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/extension-us-female.mp3 b/1000-hours/public/audios/us/extension-us-female.mp3
new file mode 100644
index 00000000..ad1f5016
Binary files /dev/null and b/1000-hours/public/audios/us/extension-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/extension-us-male.mp3 b/1000-hours/public/audios/us/extension-us-male.mp3
new file mode 100644
index 00000000..14ae42f4
Binary files /dev/null and b/1000-hours/public/audios/us/extension-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/eyewitness-us-female.mp3 b/1000-hours/public/audios/us/eyewitness-us-female.mp3
new file mode 100644
index 00000000..fd90b852
Binary files /dev/null and b/1000-hours/public/audios/us/eyewitness-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/eyewitness-us-male.mp3 b/1000-hours/public/audios/us/eyewitness-us-male.mp3
new file mode 100644
index 00000000..518b42ce
Binary files /dev/null and b/1000-hours/public/audios/us/eyewitness-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/famous-us-female.mp3 b/1000-hours/public/audios/us/famous-us-female.mp3
index 21dd430a..60796e3b 100644
Binary files a/1000-hours/public/audios/us/famous-us-female.mp3 and b/1000-hours/public/audios/us/famous-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/faster-us-female.mp3 b/1000-hours/public/audios/us/faster-us-female.mp3
new file mode 100644
index 00000000..bd8d82ff
Binary files /dev/null and b/1000-hours/public/audios/us/faster-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/faster-us-male.mp3 b/1000-hours/public/audios/us/faster-us-male.mp3
new file mode 100644
index 00000000..82fd54fe
Binary files /dev/null and b/1000-hours/public/audios/us/faster-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/fearless-us-female.mp3 b/1000-hours/public/audios/us/fearless-us-female.mp3
new file mode 100644
index 00000000..af85fadf
Binary files /dev/null and b/1000-hours/public/audios/us/fearless-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/fearless-us-male.mp3 b/1000-hours/public/audios/us/fearless-us-male.mp3
new file mode 100644
index 00000000..734f6dfc
Binary files /dev/null and b/1000-hours/public/audios/us/fearless-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/firefighter-us-female.mp3 b/1000-hours/public/audios/us/firefighter-us-female.mp3
new file mode 100644
index 00000000..d9332443
Binary files /dev/null and b/1000-hours/public/audios/us/firefighter-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/firefighter-us-male.mp3 b/1000-hours/public/audios/us/firefighter-us-male.mp3
new file mode 100644
index 00000000..ff4778c3
Binary files /dev/null and b/1000-hours/public/audios/us/firefighter-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/flexible-us-female.mp3 b/1000-hours/public/audios/us/flexible-us-female.mp3
new file mode 100644
index 00000000..8c8d88fe
Binary files /dev/null and b/1000-hours/public/audios/us/flexible-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/flexible-us-male.mp3 b/1000-hours/public/audios/us/flexible-us-male.mp3
new file mode 100644
index 00000000..688b1044
Binary files /dev/null and b/1000-hours/public/audios/us/flexible-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/football-us-female.mp3 b/1000-hours/public/audios/us/football-us-female.mp3
new file mode 100644
index 00000000..fa262289
Binary files /dev/null and b/1000-hours/public/audios/us/football-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/football-us-male.mp3 b/1000-hours/public/audios/us/football-us-male.mp3
new file mode 100644
index 00000000..4637f0d5
Binary files /dev/null and b/1000-hours/public/audios/us/football-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/fraction-us-female.mp3 b/1000-hours/public/audios/us/fraction-us-female.mp3
new file mode 100644
index 00000000..6e83b2ad
Binary files /dev/null and b/1000-hours/public/audios/us/fraction-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/fraction-us-male.mp3 b/1000-hours/public/audios/us/fraction-us-male.mp3
new file mode 100644
index 00000000..26d9d128
Binary files /dev/null and b/1000-hours/public/audios/us/fraction-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/fracture-us-female.mp3 b/1000-hours/public/audios/us/fracture-us-female.mp3
new file mode 100644
index 00000000..d105328e
Binary files /dev/null and b/1000-hours/public/audios/us/fracture-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/fracture-us-male.mp3 b/1000-hours/public/audios/us/fracture-us-male.mp3
new file mode 100644
index 00000000..ac2b5f30
Binary files /dev/null and b/1000-hours/public/audios/us/fracture-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/greenhouse-us-female.mp3 b/1000-hours/public/audios/us/greenhouse-us-female.mp3
new file mode 100644
index 00000000..1d31baa6
Binary files /dev/null and b/1000-hours/public/audios/us/greenhouse-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/greenhouse-us-male.mp3 b/1000-hours/public/audios/us/greenhouse-us-male.mp3
new file mode 100644
index 00000000..c08eb644
Binary files /dev/null and b/1000-hours/public/audios/us/greenhouse-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/handwriting-us-female.mp3 b/1000-hours/public/audios/us/handwriting-us-female.mp3
new file mode 100644
index 00000000..e32969fc
Binary files /dev/null and b/1000-hours/public/audios/us/handwriting-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/handwriting-us-male.mp3 b/1000-hours/public/audios/us/handwriting-us-male.mp3
new file mode 100644
index 00000000..8917992d
Binary files /dev/null and b/1000-hours/public/audios/us/handwriting-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/happily-us-female.mp3 b/1000-hours/public/audios/us/happily-us-female.mp3
new file mode 100644
index 00000000..cc0a4b90
Binary files /dev/null and b/1000-hours/public/audios/us/happily-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/happily-us-male.mp3 b/1000-hours/public/audios/us/happily-us-male.mp3
new file mode 100644
index 00000000..87145c38
Binary files /dev/null and b/1000-hours/public/audios/us/happily-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/happiness-us-female.mp3 b/1000-hours/public/audios/us/happiness-us-female.mp3
new file mode 100644
index 00000000..1ce4c162
Binary files /dev/null and b/1000-hours/public/audios/us/happiness-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/happiness-us-male.mp3 b/1000-hours/public/audios/us/happiness-us-male.mp3
new file mode 100644
index 00000000..92924324
Binary files /dev/null and b/1000-hours/public/audios/us/happiness-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/headache-us-female.mp3 b/1000-hours/public/audios/us/headache-us-female.mp3
new file mode 100644
index 00000000..9c2feb76
Binary files /dev/null and b/1000-hours/public/audios/us/headache-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/headache-us-male.mp3 b/1000-hours/public/audios/us/headache-us-male.mp3
new file mode 100644
index 00000000..a030a89f
Binary files /dev/null and b/1000-hours/public/audios/us/headache-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/helpful-us-female.mp3 b/1000-hours/public/audios/us/helpful-us-female.mp3
new file mode 100644
index 00000000..8ab429a2
Binary files /dev/null and b/1000-hours/public/audios/us/helpful-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/helpful-us-male.mp3 b/1000-hours/public/audios/us/helpful-us-male.mp3
new file mode 100644
index 00000000..109c4ddf
Binary files /dev/null and b/1000-hours/public/audios/us/helpful-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/highway-us-female.mp3 b/1000-hours/public/audios/us/highway-us-female.mp3
new file mode 100644
index 00000000..9748ad7b
Binary files /dev/null and b/1000-hours/public/audios/us/highway-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/highway-us-male.mp3 b/1000-hours/public/audios/us/highway-us-male.mp3
new file mode 100644
index 00000000..e827cb45
Binary files /dev/null and b/1000-hours/public/audios/us/highway-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/homework-us-female.mp3 b/1000-hours/public/audios/us/homework-us-female.mp3
new file mode 100644
index 00000000..92483303
Binary files /dev/null and b/1000-hours/public/audios/us/homework-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/homework-us-male.mp3 b/1000-hours/public/audios/us/homework-us-male.mp3
new file mode 100644
index 00000000..33885c24
Binary files /dev/null and b/1000-hours/public/audios/us/homework-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/hopeless-us-female.mp3 b/1000-hours/public/audios/us/hopeless-us-female.mp3
new file mode 100644
index 00000000..6320d201
Binary files /dev/null and b/1000-hours/public/audios/us/hopeless-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/hopeless-us-male.mp3 b/1000-hours/public/audios/us/hopeless-us-male.mp3
new file mode 100644
index 00000000..f288b14f
Binary files /dev/null and b/1000-hours/public/audios/us/hopeless-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/iceberg-us-female.mp3 b/1000-hours/public/audios/us/iceberg-us-female.mp3
new file mode 100644
index 00000000..6ca02faa
Binary files /dev/null and b/1000-hours/public/audios/us/iceberg-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/iceberg-us-male.mp3 b/1000-hours/public/audios/us/iceberg-us-male.mp3
new file mode 100644
index 00000000..fe769371
Binary files /dev/null and b/1000-hours/public/audios/us/iceberg-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/ichthyosaur-us-female.mp3 b/1000-hours/public/audios/us/ichthyosaur-us-female.mp3
new file mode 100644
index 00000000..9bb504b7
Binary files /dev/null and b/1000-hours/public/audios/us/ichthyosaur-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/ichthyosaur-us-male.mp3 b/1000-hours/public/audios/us/ichthyosaur-us-male.mp3
new file mode 100644
index 00000000..7f8fcd95
Binary files /dev/null and b/1000-hours/public/audios/us/ichthyosaur-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/import-us-female.mp3 b/1000-hours/public/audios/us/import-us-female.mp3
new file mode 100644
index 00000000..eb58b46a
Binary files /dev/null and b/1000-hours/public/audios/us/import-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/import-us-male.mp3 b/1000-hours/public/audios/us/import-us-male.mp3
new file mode 100644
index 00000000..caef6c13
Binary files /dev/null and b/1000-hours/public/audios/us/import-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/importance-us-female.mp3 b/1000-hours/public/audios/us/importance-us-female.mp3
new file mode 100644
index 00000000..321dd2a7
Binary files /dev/null and b/1000-hours/public/audios/us/importance-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/importance-us-male.mp3 b/1000-hours/public/audios/us/importance-us-male.mp3
new file mode 100644
index 00000000..5131bdf3
Binary files /dev/null and b/1000-hours/public/audios/us/importance-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/impossible-us-male.mp3 b/1000-hours/public/audios/us/impossible-us-male.mp3
index 8444fa32..c1884db6 100644
Binary files a/1000-hours/public/audios/us/impossible-us-male.mp3 and b/1000-hours/public/audios/us/impossible-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/improvement-us-female.mp3 b/1000-hours/public/audios/us/improvement-us-female.mp3
new file mode 100644
index 00000000..9ec822f4
Binary files /dev/null and b/1000-hours/public/audios/us/improvement-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/improvement-us-male.mp3 b/1000-hours/public/audios/us/improvement-us-male.mp3
new file mode 100644
index 00000000..c2091f8f
Binary files /dev/null and b/1000-hours/public/audios/us/improvement-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/incomplete-us-female.mp3 b/1000-hours/public/audios/us/incomplete-us-female.mp3
new file mode 100644
index 00000000..279e54e3
Binary files /dev/null and b/1000-hours/public/audios/us/incomplete-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/incomplete-us-male.mp3 b/1000-hours/public/audios/us/incomplete-us-male.mp3
new file mode 100644
index 00000000..d8045a39
Binary files /dev/null and b/1000-hours/public/audios/us/incomplete-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/independence-us-female.mp3 b/1000-hours/public/audios/us/independence-us-female.mp3
new file mode 100644
index 00000000..e3ee7f3e
Binary files /dev/null and b/1000-hours/public/audios/us/independence-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/independence-us-male.mp3 b/1000-hours/public/audios/us/independence-us-male.mp3
new file mode 100644
index 00000000..5a9c4a63
Binary files /dev/null and b/1000-hours/public/audios/us/independence-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/infraction-us-female.mp3 b/1000-hours/public/audios/us/infraction-us-female.mp3
new file mode 100644
index 00000000..66ceab29
Binary files /dev/null and b/1000-hours/public/audios/us/infraction-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/infraction-us-male.mp3 b/1000-hours/public/audios/us/infraction-us-male.mp3
new file mode 100644
index 00000000..c0f51476
Binary files /dev/null and b/1000-hours/public/audios/us/infraction-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/inject-us-female.mp3 b/1000-hours/public/audios/us/inject-us-female.mp3
new file mode 100644
index 00000000..c6e9cbf7
Binary files /dev/null and b/1000-hours/public/audios/us/inject-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/inject-us-male.mp3 b/1000-hours/public/audios/us/inject-us-male.mp3
new file mode 100644
index 00000000..fe8cfec7
Binary files /dev/null and b/1000-hours/public/audios/us/inject-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/inside-us-female.mp3 b/1000-hours/public/audios/us/inside-us-female.mp3
new file mode 100644
index 00000000..e8978bfc
Binary files /dev/null and b/1000-hours/public/audios/us/inside-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/inside-us-male.mp3 b/1000-hours/public/audios/us/inside-us-male.mp3
new file mode 100644
index 00000000..4d08bafa
Binary files /dev/null and b/1000-hours/public/audios/us/inside-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/inspect-us-female.mp3 b/1000-hours/public/audios/us/inspect-us-female.mp3
new file mode 100644
index 00000000..2faf411d
Binary files /dev/null and b/1000-hours/public/audios/us/inspect-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/inspect-us-male.mp3 b/1000-hours/public/audios/us/inspect-us-male.mp3
new file mode 100644
index 00000000..0079fa1e
Binary files /dev/null and b/1000-hours/public/audios/us/inspect-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/interact-us-female.mp3 b/1000-hours/public/audios/us/interact-us-female.mp3
new file mode 100644
index 00000000..b8f9a2f3
Binary files /dev/null and b/1000-hours/public/audios/us/interact-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/interact-us-male.mp3 b/1000-hours/public/audios/us/interact-us-male.mp3
new file mode 100644
index 00000000..3d1d34a5
Binary files /dev/null and b/1000-hours/public/audios/us/interact-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/international-us-female.mp3 b/1000-hours/public/audios/us/international-us-female.mp3
index fdfffbc3..f19e13ea 100644
Binary files a/1000-hours/public/audios/us/international-us-female.mp3 and b/1000-hours/public/audios/us/international-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/international-us-male.mp3 b/1000-hours/public/audios/us/international-us-male.mp3
index 9145f87f..b1d748b9 100644
Binary files a/1000-hours/public/audios/us/international-us-male.mp3 and b/1000-hours/public/audios/us/international-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/interrupt-us-female.mp3 b/1000-hours/public/audios/us/interrupt-us-female.mp3
new file mode 100644
index 00000000..0c4126e1
Binary files /dev/null and b/1000-hours/public/audios/us/interrupt-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/interrupt-us-male.mp3 b/1000-hours/public/audios/us/interrupt-us-male.mp3
new file mode 100644
index 00000000..cf712055
Binary files /dev/null and b/1000-hours/public/audios/us/interrupt-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/intersect-us-female.mp3 b/1000-hours/public/audios/us/intersect-us-female.mp3
new file mode 100644
index 00000000..cfc4092c
Binary files /dev/null and b/1000-hours/public/audios/us/intersect-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/intersect-us-male.mp3 b/1000-hours/public/audios/us/intersect-us-male.mp3
new file mode 100644
index 00000000..791b599a
Binary files /dev/null and b/1000-hours/public/audios/us/intersect-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/inventor-us-female.mp3 b/1000-hours/public/audios/us/inventor-us-female.mp3
new file mode 100644
index 00000000..599fcac6
Binary files /dev/null and b/1000-hours/public/audios/us/inventor-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/inventor-us-male.mp3 b/1000-hours/public/audios/us/inventor-us-male.mp3
new file mode 100644
index 00000000..a96ebe94
Binary files /dev/null and b/1000-hours/public/audios/us/inventor-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/invisible-us-female.mp3 b/1000-hours/public/audios/us/invisible-us-female.mp3
new file mode 100644
index 00000000..de14b6e2
Binary files /dev/null and b/1000-hours/public/audios/us/invisible-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/invisible-us-male.mp3 b/1000-hours/public/audios/us/invisible-us-male.mp3
new file mode 100644
index 00000000..c21d2a82
Binary files /dev/null and b/1000-hours/public/audios/us/invisible-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/jellyfish-us-female.mp3 b/1000-hours/public/audios/us/jellyfish-us-female.mp3
new file mode 100644
index 00000000..6d9eaf3a
Binary files /dev/null and b/1000-hours/public/audios/us/jellyfish-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/jellyfish-us-male.mp3 b/1000-hours/public/audios/us/jellyfish-us-male.mp3
new file mode 100644
index 00000000..8b442427
Binary files /dev/null and b/1000-hours/public/audios/us/jellyfish-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/joyful-us-female.mp3 b/1000-hours/public/audios/us/joyful-us-female.mp3
new file mode 100644
index 00000000..87123f8e
Binary files /dev/null and b/1000-hours/public/audios/us/joyful-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/joyful-us-male.mp3 b/1000-hours/public/audios/us/joyful-us-male.mp3
new file mode 100644
index 00000000..3b111618
Binary files /dev/null and b/1000-hours/public/audios/us/joyful-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/judgment-us-female.mp3 b/1000-hours/public/audios/us/judgment-us-female.mp3
new file mode 100644
index 00000000..9fafac6e
Binary files /dev/null and b/1000-hours/public/audios/us/judgment-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/judgment-us-male.mp3 b/1000-hours/public/audios/us/judgment-us-male.mp3
new file mode 100644
index 00000000..279aaa9b
Binary files /dev/null and b/1000-hours/public/audios/us/judgment-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/judicial-us-female.mp3 b/1000-hours/public/audios/us/judicial-us-female.mp3
new file mode 100644
index 00000000..be84803a
Binary files /dev/null and b/1000-hours/public/audios/us/judicial-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/judicial-us-male.mp3 b/1000-hours/public/audios/us/judicial-us-male.mp3
new file mode 100644
index 00000000..416ffa25
Binary files /dev/null and b/1000-hours/public/audios/us/judicial-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/kindness-us-female.mp3 b/1000-hours/public/audios/us/kindness-us-female.mp3
new file mode 100644
index 00000000..19f5b674
Binary files /dev/null and b/1000-hours/public/audios/us/kindness-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/kindness-us-male.mp3 b/1000-hours/public/audios/us/kindness-us-male.mp3
new file mode 100644
index 00000000..7d40c0da
Binary files /dev/null and b/1000-hours/public/audios/us/kindness-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/laptop-us-female.mp3 b/1000-hours/public/audios/us/laptop-us-female.mp3
new file mode 100644
index 00000000..b859e945
Binary files /dev/null and b/1000-hours/public/audios/us/laptop-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/laptop-us-male.mp3 b/1000-hours/public/audios/us/laptop-us-male.mp3
new file mode 100644
index 00000000..ea420379
Binary files /dev/null and b/1000-hours/public/audios/us/laptop-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/lighthouse-us-female.mp3 b/1000-hours/public/audios/us/lighthouse-us-female.mp3
new file mode 100644
index 00000000..85b60bfe
Binary files /dev/null and b/1000-hours/public/audios/us/lighthouse-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/lighthouse-us-male.mp3 b/1000-hours/public/audios/us/lighthouse-us-male.mp3
new file mode 100644
index 00000000..20b26a4a
Binary files /dev/null and b/1000-hours/public/audios/us/lighthouse-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/mailbox-us-female.mp3 b/1000-hours/public/audios/us/mailbox-us-female.mp3
new file mode 100644
index 00000000..8fcbb24b
Binary files /dev/null and b/1000-hours/public/audios/us/mailbox-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/mailbox-us-male.mp3 b/1000-hours/public/audios/us/mailbox-us-male.mp3
new file mode 100644
index 00000000..e5dcb004
Binary files /dev/null and b/1000-hours/public/audios/us/mailbox-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/malfunction-us-female.mp3 b/1000-hours/public/audios/us/malfunction-us-female.mp3
new file mode 100644
index 00000000..aab8228f
Binary files /dev/null and b/1000-hours/public/audios/us/malfunction-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/malfunction-us-male.mp3 b/1000-hours/public/audios/us/malfunction-us-male.mp3
new file mode 100644
index 00000000..6b1968dd
Binary files /dev/null and b/1000-hours/public/audios/us/malfunction-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/malicious-us-female.mp3 b/1000-hours/public/audios/us/malicious-us-female.mp3
new file mode 100644
index 00000000..ea067292
Binary files /dev/null and b/1000-hours/public/audios/us/malicious-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/malicious-us-male.mp3 b/1000-hours/public/audios/us/malicious-us-male.mp3
new file mode 100644
index 00000000..345c7c8a
Binary files /dev/null and b/1000-hours/public/audios/us/malicious-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/malnutrition-us-female.mp3 b/1000-hours/public/audios/us/malnutrition-us-female.mp3
new file mode 100644
index 00000000..01e9426e
Binary files /dev/null and b/1000-hours/public/audios/us/malnutrition-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/malnutrition-us-male.mp3 b/1000-hours/public/audios/us/malnutrition-us-male.mp3
new file mode 100644
index 00000000..9d11d07e
Binary files /dev/null and b/1000-hours/public/audios/us/malnutrition-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/manageable-us-female.mp3 b/1000-hours/public/audios/us/manageable-us-female.mp3
new file mode 100644
index 00000000..d21a0052
Binary files /dev/null and b/1000-hours/public/audios/us/manageable-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/manageable-us-male.mp3 b/1000-hours/public/audios/us/manageable-us-male.mp3
new file mode 100644
index 00000000..a06c7141
Binary files /dev/null and b/1000-hours/public/audios/us/manageable-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/manuscript-us-female.mp3 b/1000-hours/public/audios/us/manuscript-us-female.mp3
new file mode 100644
index 00000000..28ae1cef
Binary files /dev/null and b/1000-hours/public/audios/us/manuscript-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/manuscript-us-male.mp3 b/1000-hours/public/audios/us/manuscript-us-male.mp3
new file mode 100644
index 00000000..2a89f0f3
Binary files /dev/null and b/1000-hours/public/audios/us/manuscript-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/maternal-us-female.mp3 b/1000-hours/public/audios/us/maternal-us-female.mp3
new file mode 100644
index 00000000..0509a288
Binary files /dev/null and b/1000-hours/public/audios/us/maternal-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/maternal-us-male.mp3 b/1000-hours/public/audios/us/maternal-us-male.mp3
new file mode 100644
index 00000000..1c998f6d
Binary files /dev/null and b/1000-hours/public/audios/us/maternal-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/maternity-us-female.mp3 b/1000-hours/public/audios/us/maternity-us-female.mp3
new file mode 100644
index 00000000..cf19f1a7
Binary files /dev/null and b/1000-hours/public/audios/us/maternity-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/maternity-us-male.mp3 b/1000-hours/public/audios/us/maternity-us-male.mp3
new file mode 100644
index 00000000..4f50067e
Binary files /dev/null and b/1000-hours/public/audios/us/maternity-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/matriarch-us-female.mp3 b/1000-hours/public/audios/us/matriarch-us-female.mp3
new file mode 100644
index 00000000..bb1b2cf5
Binary files /dev/null and b/1000-hours/public/audios/us/matriarch-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/matriarch-us-male.mp3 b/1000-hours/public/audios/us/matriarch-us-male.mp3
new file mode 100644
index 00000000..01cda3f0
Binary files /dev/null and b/1000-hours/public/audios/us/matriarch-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/midfield-us-female.mp3 b/1000-hours/public/audios/us/midfield-us-female.mp3
new file mode 100644
index 00000000..c5ee080a
Binary files /dev/null and b/1000-hours/public/audios/us/midfield-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/midfield-us-male.mp3 b/1000-hours/public/audios/us/midfield-us-male.mp3
new file mode 100644
index 00000000..f926dad2
Binary files /dev/null and b/1000-hours/public/audios/us/midfield-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/midnight-us-female.mp3 b/1000-hours/public/audios/us/midnight-us-female.mp3
new file mode 100644
index 00000000..a3809158
Binary files /dev/null and b/1000-hours/public/audios/us/midnight-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/midnight-us-male.mp3 b/1000-hours/public/audios/us/midnight-us-male.mp3
new file mode 100644
index 00000000..305ea856
Binary files /dev/null and b/1000-hours/public/audios/us/midnight-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/midterm-us-female.mp3 b/1000-hours/public/audios/us/midterm-us-female.mp3
new file mode 100644
index 00000000..68040fa6
Binary files /dev/null and b/1000-hours/public/audios/us/midterm-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/midterm-us-male.mp3 b/1000-hours/public/audios/us/midterm-us-male.mp3
new file mode 100644
index 00000000..30b94438
Binary files /dev/null and b/1000-hours/public/audios/us/midterm-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/mislead-us-female.mp3 b/1000-hours/public/audios/us/mislead-us-female.mp3
new file mode 100644
index 00000000..dcdf395f
Binary files /dev/null and b/1000-hours/public/audios/us/mislead-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/mislead-us-male.mp3 b/1000-hours/public/audios/us/mislead-us-male.mp3
new file mode 100644
index 00000000..97d6d049
Binary files /dev/null and b/1000-hours/public/audios/us/mislead-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/misplace-us-female.mp3 b/1000-hours/public/audios/us/misplace-us-female.mp3
new file mode 100644
index 00000000..a2ab9f7e
Binary files /dev/null and b/1000-hours/public/audios/us/misplace-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/misplace-us-male.mp3 b/1000-hours/public/audios/us/misplace-us-male.mp3
new file mode 100644
index 00000000..f1315eb2
Binary files /dev/null and b/1000-hours/public/audios/us/misplace-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/misunderstand-us-female.mp3 b/1000-hours/public/audios/us/misunderstand-us-female.mp3
new file mode 100644
index 00000000..c6aa0125
Binary files /dev/null and b/1000-hours/public/audios/us/misunderstand-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/misunderstand-us-male.mp3 b/1000-hours/public/audios/us/misunderstand-us-male.mp3
new file mode 100644
index 00000000..ef6c6c9e
Binary files /dev/null and b/1000-hours/public/audios/us/misunderstand-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/moonlight-us-female.mp3 b/1000-hours/public/audios/us/moonlight-us-female.mp3
new file mode 100644
index 00000000..6f12474e
Binary files /dev/null and b/1000-hours/public/audios/us/moonlight-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/moonlight-us-male.mp3 b/1000-hours/public/audios/us/moonlight-us-male.mp3
new file mode 100644
index 00000000..feebb308
Binary files /dev/null and b/1000-hours/public/audios/us/moonlight-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/mortal-us-female.mp3 b/1000-hours/public/audios/us/mortal-us-female.mp3
new file mode 100644
index 00000000..0ebd9b12
Binary files /dev/null and b/1000-hours/public/audios/us/mortal-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/mortal-us-male.mp3 b/1000-hours/public/audios/us/mortal-us-male.mp3
new file mode 100644
index 00000000..d97cc58e
Binary files /dev/null and b/1000-hours/public/audios/us/mortal-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/mortician-us-female.mp3 b/1000-hours/public/audios/us/mortician-us-female.mp3
new file mode 100644
index 00000000..c71fe203
Binary files /dev/null and b/1000-hours/public/audios/us/mortician-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/mortician-us-male.mp3 b/1000-hours/public/audios/us/mortician-us-male.mp3
new file mode 100644
index 00000000..6362b12b
Binary files /dev/null and b/1000-hours/public/audios/us/mortician-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/mortify-us-female.mp3 b/1000-hours/public/audios/us/mortify-us-female.mp3
new file mode 100644
index 00000000..82913b33
Binary files /dev/null and b/1000-hours/public/audios/us/mortify-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/mortify-us-male.mp3 b/1000-hours/public/audios/us/mortify-us-male.mp3
new file mode 100644
index 00000000..5afd7fa1
Binary files /dev/null and b/1000-hours/public/audios/us/mortify-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/multinational-us-female.mp3 b/1000-hours/public/audios/us/multinational-us-female.mp3
new file mode 100644
index 00000000..edfc374c
Binary files /dev/null and b/1000-hours/public/audios/us/multinational-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/multinational-us-male.mp3 b/1000-hours/public/audios/us/multinational-us-male.mp3
new file mode 100644
index 00000000..68d2d3f8
Binary files /dev/null and b/1000-hours/public/audios/us/multinational-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/multiple-us-female.mp3 b/1000-hours/public/audios/us/multiple-us-female.mp3
new file mode 100644
index 00000000..bffca8c0
Binary files /dev/null and b/1000-hours/public/audios/us/multiple-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/multiple-us-male.mp3 b/1000-hours/public/audios/us/multiple-us-male.mp3
new file mode 100644
index 00000000..49070323
Binary files /dev/null and b/1000-hours/public/audios/us/multiple-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/multiply-us-female.mp3 b/1000-hours/public/audios/us/multiply-us-female.mp3
new file mode 100644
index 00000000..3ae7f883
Binary files /dev/null and b/1000-hours/public/audios/us/multiply-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/multiply-us-male.mp3 b/1000-hours/public/audios/us/multiply-us-male.mp3
new file mode 100644
index 00000000..6f981320
Binary files /dev/null and b/1000-hours/public/audios/us/multiply-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/musical-us-female.mp3 b/1000-hours/public/audios/us/musical-us-female.mp3
new file mode 100644
index 00000000..4f92e5a1
Binary files /dev/null and b/1000-hours/public/audios/us/musical-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/musical-us-male.mp3 b/1000-hours/public/audios/us/musical-us-male.mp3
new file mode 100644
index 00000000..0115e706
Binary files /dev/null and b/1000-hours/public/audios/us/musical-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/natural-us-female.mp3 b/1000-hours/public/audios/us/natural-us-female.mp3
new file mode 100644
index 00000000..871db3a7
Binary files /dev/null and b/1000-hours/public/audios/us/natural-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/natural-us-male.mp3 b/1000-hours/public/audios/us/natural-us-male.mp3
new file mode 100644
index 00000000..6830ed51
Binary files /dev/null and b/1000-hours/public/audios/us/natural-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/nervous-us-female.mp3 b/1000-hours/public/audios/us/nervous-us-female.mp3
new file mode 100644
index 00000000..f0bf5790
Binary files /dev/null and b/1000-hours/public/audios/us/nervous-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/nervous-us-male.mp3 b/1000-hours/public/audios/us/nervous-us-male.mp3
new file mode 100644
index 00000000..b5067518
Binary files /dev/null and b/1000-hours/public/audios/us/nervous-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/nobody-us-female.mp3 b/1000-hours/public/audios/us/nobody-us-female.mp3
new file mode 100644
index 00000000..5a1a7e8c
Binary files /dev/null and b/1000-hours/public/audios/us/nobody-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/nobody-us-male.mp3 b/1000-hours/public/audios/us/nobody-us-male.mp3
new file mode 100644
index 00000000..daf8a3fc
Binary files /dev/null and b/1000-hours/public/audios/us/nobody-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/nonexistent-us-female.mp3 b/1000-hours/public/audios/us/nonexistent-us-female.mp3
new file mode 100644
index 00000000..abe3086f
Binary files /dev/null and b/1000-hours/public/audios/us/nonexistent-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/nonexistent-us-male.mp3 b/1000-hours/public/audios/us/nonexistent-us-male.mp3
new file mode 100644
index 00000000..310ed6fb
Binary files /dev/null and b/1000-hours/public/audios/us/nonexistent-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/nonprofit-us-female.mp3 b/1000-hours/public/audios/us/nonprofit-us-female.mp3
new file mode 100644
index 00000000..0294e62d
Binary files /dev/null and b/1000-hours/public/audios/us/nonprofit-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/nonprofit-us-male.mp3 b/1000-hours/public/audios/us/nonprofit-us-male.mp3
new file mode 100644
index 00000000..e0b6228c
Binary files /dev/null and b/1000-hours/public/audios/us/nonprofit-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/nonsense-us-female.mp3 b/1000-hours/public/audios/us/nonsense-us-female.mp3
new file mode 100644
index 00000000..42e0ee86
Binary files /dev/null and b/1000-hours/public/audios/us/nonsense-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/nonsense-us-male.mp3 b/1000-hours/public/audios/us/nonsense-us-male.mp3
new file mode 100644
index 00000000..480a1a9e
Binary files /dev/null and b/1000-hours/public/audios/us/nonsense-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/nonstick-us-female.mp3 b/1000-hours/public/audios/us/nonstick-us-female.mp3
new file mode 100644
index 00000000..8667d509
Binary files /dev/null and b/1000-hours/public/audios/us/nonstick-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/nonstick-us-male.mp3 b/1000-hours/public/audios/us/nonstick-us-male.mp3
new file mode 100644
index 00000000..aee8a838
Binary files /dev/null and b/1000-hours/public/audios/us/nonstick-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/nonviolent-us-female.mp3 b/1000-hours/public/audios/us/nonviolent-us-female.mp3
new file mode 100644
index 00000000..50cfd362
Binary files /dev/null and b/1000-hours/public/audios/us/nonviolent-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/nonviolent-us-male.mp3 b/1000-hours/public/audios/us/nonviolent-us-male.mp3
new file mode 100644
index 00000000..3575f24e
Binary files /dev/null and b/1000-hours/public/audios/us/nonviolent-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/notebook-us-female.mp3 b/1000-hours/public/audios/us/notebook-us-female.mp3
new file mode 100644
index 00000000..4ad06d3a
Binary files /dev/null and b/1000-hours/public/audios/us/notebook-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/notebook-us-male.mp3 b/1000-hours/public/audios/us/notebook-us-male.mp3
new file mode 100644
index 00000000..8ebb43d9
Binary files /dev/null and b/1000-hours/public/audios/us/notebook-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/overeat-us-female.mp3 b/1000-hours/public/audios/us/overeat-us-female.mp3
new file mode 100644
index 00000000..f49afe28
Binary files /dev/null and b/1000-hours/public/audios/us/overeat-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/overeat-us-male.mp3 b/1000-hours/public/audios/us/overeat-us-male.mp3
new file mode 100644
index 00000000..cdf22e9e
Binary files /dev/null and b/1000-hours/public/audios/us/overeat-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/overheat-us-female.mp3 b/1000-hours/public/audios/us/overheat-us-female.mp3
new file mode 100644
index 00000000..633f7dab
Binary files /dev/null and b/1000-hours/public/audios/us/overheat-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/overheat-us-male.mp3 b/1000-hours/public/audios/us/overheat-us-male.mp3
new file mode 100644
index 00000000..ae923036
Binary files /dev/null and b/1000-hours/public/audios/us/overheat-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/overwork-us-female.mp3 b/1000-hours/public/audios/us/overwork-us-female.mp3
new file mode 100644
index 00000000..e26091f9
Binary files /dev/null and b/1000-hours/public/audios/us/overwork-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/overwork-us-male.mp3 b/1000-hours/public/audios/us/overwork-us-male.mp3
new file mode 100644
index 00000000..3d23e359
Binary files /dev/null and b/1000-hours/public/audios/us/overwork-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/pancake-us-female.mp3 b/1000-hours/public/audios/us/pancake-us-female.mp3
new file mode 100644
index 00000000..d1ac33bf
Binary files /dev/null and b/1000-hours/public/audios/us/pancake-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/pancake-us-male.mp3 b/1000-hours/public/audios/us/pancake-us-male.mp3
new file mode 100644
index 00000000..77a77d44
Binary files /dev/null and b/1000-hours/public/audios/us/pancake-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/pendant-us-female.mp3 b/1000-hours/public/audios/us/pendant-us-female.mp3
new file mode 100644
index 00000000..afd398c7
Binary files /dev/null and b/1000-hours/public/audios/us/pendant-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/pendant-us-male.mp3 b/1000-hours/public/audios/us/pendant-us-male.mp3
new file mode 100644
index 00000000..c8d84e0a
Binary files /dev/null and b/1000-hours/public/audios/us/pendant-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/percent-us-female.mp3 b/1000-hours/public/audios/us/percent-us-female.mp3
new file mode 100644
index 00000000..e32c0cf0
Binary files /dev/null and b/1000-hours/public/audios/us/percent-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/percent-us-male.mp3 b/1000-hours/public/audios/us/percent-us-male.mp3
new file mode 100644
index 00000000..8a91c057
Binary files /dev/null and b/1000-hours/public/audios/us/percent-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/performance-us-female.mp3 b/1000-hours/public/audios/us/performance-us-female.mp3
new file mode 100644
index 00000000..ebaa18a7
Binary files /dev/null and b/1000-hours/public/audios/us/performance-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/performance-us-male.mp3 b/1000-hours/public/audios/us/performance-us-male.mp3
new file mode 100644
index 00000000..db5dad83
Binary files /dev/null and b/1000-hours/public/audios/us/performance-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/personal-us-female.mp3 b/1000-hours/public/audios/us/personal-us-female.mp3
new file mode 100644
index 00000000..83c399e0
Binary files /dev/null and b/1000-hours/public/audios/us/personal-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/personal-us-male.mp3 b/1000-hours/public/audios/us/personal-us-male.mp3
new file mode 100644
index 00000000..ed824fe9
Binary files /dev/null and b/1000-hours/public/audios/us/personal-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/pianist-us-female.mp3 b/1000-hours/public/audios/us/pianist-us-female.mp3
new file mode 100644
index 00000000..488c3568
Binary files /dev/null and b/1000-hours/public/audios/us/pianist-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/pianist-us-male.mp3 b/1000-hours/public/audios/us/pianist-us-male.mp3
new file mode 100644
index 00000000..b109cb19
Binary files /dev/null and b/1000-hours/public/audios/us/pianist-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/postcard-us-female.mp3 b/1000-hours/public/audios/us/postcard-us-female.mp3
new file mode 100644
index 00000000..5e3f85f5
Binary files /dev/null and b/1000-hours/public/audios/us/postcard-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/postcard-us-male.mp3 b/1000-hours/public/audios/us/postcard-us-male.mp3
new file mode 100644
index 00000000..0f7bff39
Binary files /dev/null and b/1000-hours/public/audios/us/postcard-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/predict-us-female.mp3 b/1000-hours/public/audios/us/predict-us-female.mp3
new file mode 100644
index 00000000..1eb13b41
Binary files /dev/null and b/1000-hours/public/audios/us/predict-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/predict-us-male.mp3 b/1000-hours/public/audios/us/predict-us-male.mp3
new file mode 100644
index 00000000..4c27d0ae
Binary files /dev/null and b/1000-hours/public/audios/us/predict-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/prejudice-us-female.mp3 b/1000-hours/public/audios/us/prejudice-us-female.mp3
new file mode 100644
index 00000000..c75d76e4
Binary files /dev/null and b/1000-hours/public/audios/us/prejudice-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/prejudice-us-male.mp3 b/1000-hours/public/audios/us/prejudice-us-male.mp3
new file mode 100644
index 00000000..2c398b9a
Binary files /dev/null and b/1000-hours/public/audios/us/prejudice-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/preschool-us-female.mp3 b/1000-hours/public/audios/us/preschool-us-female.mp3
new file mode 100644
index 00000000..29827e50
Binary files /dev/null and b/1000-hours/public/audios/us/preschool-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/preschool-us-male.mp3 b/1000-hours/public/audios/us/preschool-us-male.mp3
new file mode 100644
index 00000000..aa073758
Binary files /dev/null and b/1000-hours/public/audios/us/preschool-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/preview-us-female.mp3 b/1000-hours/public/audios/us/preview-us-female.mp3
new file mode 100644
index 00000000..d2dce7bf
Binary files /dev/null and b/1000-hours/public/audios/us/preview-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/preview-us-male.mp3 b/1000-hours/public/audios/us/preview-us-male.mp3
new file mode 100644
index 00000000..259aa8c1
Binary files /dev/null and b/1000-hours/public/audios/us/preview-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/produce-us-female.mp3 b/1000-hours/public/audios/us/produce-us-female.mp3
new file mode 100644
index 00000000..f8471ffc
Binary files /dev/null and b/1000-hours/public/audios/us/produce-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/produce-us-male.mp3 b/1000-hours/public/audios/us/produce-us-male.mp3
new file mode 100644
index 00000000..48048d5a
Binary files /dev/null and b/1000-hours/public/audios/us/produce-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/project-us-female.mp3 b/1000-hours/public/audios/us/project-us-female.mp3
new file mode 100644
index 00000000..771e06e4
Binary files /dev/null and b/1000-hours/public/audios/us/project-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/project-us-male.mp3 b/1000-hours/public/audios/us/project-us-male.mp3
new file mode 100644
index 00000000..588998ed
Binary files /dev/null and b/1000-hours/public/audios/us/project-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/quickly-us-female.mp3 b/1000-hours/public/audios/us/quickly-us-female.mp3
new file mode 100644
index 00000000..9b33fd98
Binary files /dev/null and b/1000-hours/public/audios/us/quickly-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/quickly-us-male.mp3 b/1000-hours/public/audios/us/quickly-us-male.mp3
new file mode 100644
index 00000000..d620a4b3
Binary files /dev/null and b/1000-hours/public/audios/us/quickly-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/rainbow-us-female.mp3 b/1000-hours/public/audios/us/rainbow-us-female.mp3
new file mode 100644
index 00000000..d0a907a6
Binary files /dev/null and b/1000-hours/public/audios/us/rainbow-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/rainbow-us-male.mp3 b/1000-hours/public/audios/us/rainbow-us-male.mp3
new file mode 100644
index 00000000..48f2e3c9
Binary files /dev/null and b/1000-hours/public/audios/us/rainbow-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/readable-us-female.mp3 b/1000-hours/public/audios/us/readable-us-female.mp3
new file mode 100644
index 00000000..d37e0945
Binary files /dev/null and b/1000-hours/public/audios/us/readable-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/readable-us-male.mp3 b/1000-hours/public/audios/us/readable-us-male.mp3
new file mode 100644
index 00000000..107d836b
Binary files /dev/null and b/1000-hours/public/audios/us/readable-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/reality-us-female.mp3 b/1000-hours/public/audios/us/reality-us-female.mp3
new file mode 100644
index 00000000..38332b38
Binary files /dev/null and b/1000-hours/public/audios/us/reality-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/reality-us-male.mp3 b/1000-hours/public/audios/us/reality-us-male.mp3
new file mode 100644
index 00000000..53271b50
Binary files /dev/null and b/1000-hours/public/audios/us/reality-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/redo-us-female.mp3 b/1000-hours/public/audios/us/redo-us-female.mp3
new file mode 100644
index 00000000..5ecf79e3
Binary files /dev/null and b/1000-hours/public/audios/us/redo-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/redo-us-male.mp3 b/1000-hours/public/audios/us/redo-us-male.mp3
new file mode 100644
index 00000000..0840cde7
Binary files /dev/null and b/1000-hours/public/audios/us/redo-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/reduce-us-female.mp3 b/1000-hours/public/audios/us/reduce-us-female.mp3
new file mode 100644
index 00000000..9785cfca
Binary files /dev/null and b/1000-hours/public/audios/us/reduce-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/reduce-us-male.mp3 b/1000-hours/public/audios/us/reduce-us-male.mp3
new file mode 100644
index 00000000..81064724
Binary files /dev/null and b/1000-hours/public/audios/us/reduce-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/reject-us-female.mp3 b/1000-hours/public/audios/us/reject-us-female.mp3
new file mode 100644
index 00000000..e6fc8eb3
Binary files /dev/null and b/1000-hours/public/audios/us/reject-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/reject-us-male.mp3 b/1000-hours/public/audios/us/reject-us-male.mp3
new file mode 100644
index 00000000..20e2183f
Binary files /dev/null and b/1000-hours/public/audios/us/reject-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/return-us-female.mp3 b/1000-hours/public/audios/us/return-us-female.mp3
new file mode 100644
index 00000000..1084b0ee
Binary files /dev/null and b/1000-hours/public/audios/us/return-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/return-us-male.mp3 b/1000-hours/public/audios/us/return-us-male.mp3
new file mode 100644
index 00000000..9ff59c3f
Binary files /dev/null and b/1000-hours/public/audios/us/return-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/review-us-female.mp3 b/1000-hours/public/audios/us/review-us-female.mp3
new file mode 100644
index 00000000..248ea364
Binary files /dev/null and b/1000-hours/public/audios/us/review-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/review-us-male.mp3 b/1000-hours/public/audios/us/review-us-male.mp3
new file mode 100644
index 00000000..2a4be421
Binary files /dev/null and b/1000-hours/public/audios/us/review-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/runner-us-female.mp3 b/1000-hours/public/audios/us/runner-us-female.mp3
new file mode 100644
index 00000000..9d9d27e6
Binary files /dev/null and b/1000-hours/public/audios/us/runner-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/runner-us-male.mp3 b/1000-hours/public/audios/us/runner-us-male.mp3
new file mode 100644
index 00000000..5daa7627
Binary files /dev/null and b/1000-hours/public/audios/us/runner-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/sailboat-us-female.mp3 b/1000-hours/public/audios/us/sailboat-us-female.mp3
new file mode 100644
index 00000000..54dd1b3b
Binary files /dev/null and b/1000-hours/public/audios/us/sailboat-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/sailboat-us-male.mp3 b/1000-hours/public/audios/us/sailboat-us-male.mp3
new file mode 100644
index 00000000..7f93cd5d
Binary files /dev/null and b/1000-hours/public/audios/us/sailboat-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/sandbox-us-female.mp3 b/1000-hours/public/audios/us/sandbox-us-female.mp3
new file mode 100644
index 00000000..91e670b9
Binary files /dev/null and b/1000-hours/public/audios/us/sandbox-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/sandbox-us-male.mp3 b/1000-hours/public/audios/us/sandbox-us-male.mp3
new file mode 100644
index 00000000..4708c066
Binary files /dev/null and b/1000-hours/public/audios/us/sandbox-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/scientist-us-female.mp3 b/1000-hours/public/audios/us/scientist-us-female.mp3
new file mode 100644
index 00000000..ae54d371
Binary files /dev/null and b/1000-hours/public/audios/us/scientist-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/scientist-us-male.mp3 b/1000-hours/public/audios/us/scientist-us-male.mp3
new file mode 100644
index 00000000..ba7150ab
Binary files /dev/null and b/1000-hours/public/audios/us/scientist-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/seashore-us-female.mp3 b/1000-hours/public/audios/us/seashore-us-female.mp3
new file mode 100644
index 00000000..1bc5804f
Binary files /dev/null and b/1000-hours/public/audios/us/seashore-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/seashore-us-male.mp3 b/1000-hours/public/audios/us/seashore-us-male.mp3
new file mode 100644
index 00000000..685b52c3
Binary files /dev/null and b/1000-hours/public/audios/us/seashore-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/section-us-female.mp3 b/1000-hours/public/audios/us/section-us-female.mp3
new file mode 100644
index 00000000..f4af3ad6
Binary files /dev/null and b/1000-hours/public/audios/us/section-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/section-us-male.mp3 b/1000-hours/public/audios/us/section-us-male.mp3
new file mode 100644
index 00000000..906c63da
Binary files /dev/null and b/1000-hours/public/audios/us/section-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/semicircle-us-female.mp3 b/1000-hours/public/audios/us/semicircle-us-female.mp3
new file mode 100644
index 00000000..4fd7dad2
Binary files /dev/null and b/1000-hours/public/audios/us/semicircle-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/semicircle-us-male.mp3 b/1000-hours/public/audios/us/semicircle-us-male.mp3
new file mode 100644
index 00000000..e2491801
Binary files /dev/null and b/1000-hours/public/audios/us/semicircle-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/semiconscious-us-female.mp3 b/1000-hours/public/audios/us/semiconscious-us-female.mp3
new file mode 100644
index 00000000..a80025b6
Binary files /dev/null and b/1000-hours/public/audios/us/semiconscious-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/semiconscious-us-male.mp3 b/1000-hours/public/audios/us/semiconscious-us-male.mp3
new file mode 100644
index 00000000..b5b18539
Binary files /dev/null and b/1000-hours/public/audios/us/semiconscious-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/semifinal-us-female.mp3 b/1000-hours/public/audios/us/semifinal-us-female.mp3
new file mode 100644
index 00000000..66603fc2
Binary files /dev/null and b/1000-hours/public/audios/us/semifinal-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/semifinal-us-male.mp3 b/1000-hours/public/audios/us/semifinal-us-male.mp3
new file mode 100644
index 00000000..0ee50d14
Binary files /dev/null and b/1000-hours/public/audios/us/semifinal-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/sensation-us-female.mp3 b/1000-hours/public/audios/us/sensation-us-female.mp3
new file mode 100644
index 00000000..e3665679
Binary files /dev/null and b/1000-hours/public/audios/us/sensation-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/sensation-us-male.mp3 b/1000-hours/public/audios/us/sensation-us-male.mp3
new file mode 100644
index 00000000..162cf955
Binary files /dev/null and b/1000-hours/public/audios/us/sensation-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/sensitive-us-female.mp3 b/1000-hours/public/audios/us/sensitive-us-female.mp3
new file mode 100644
index 00000000..50112d8b
Binary files /dev/null and b/1000-hours/public/audios/us/sensitive-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/sensitive-us-male.mp3 b/1000-hours/public/audios/us/sensitive-us-male.mp3
new file mode 100644
index 00000000..e01480ee
Binary files /dev/null and b/1000-hours/public/audios/us/sensitive-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/simplicity-us-female.mp3 b/1000-hours/public/audios/us/simplicity-us-female.mp3
new file mode 100644
index 00000000..73e5f730
Binary files /dev/null and b/1000-hours/public/audios/us/simplicity-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/simplicity-us-male.mp3 b/1000-hours/public/audios/us/simplicity-us-male.mp3
new file mode 100644
index 00000000..e97238e5
Binary files /dev/null and b/1000-hours/public/audios/us/simplicity-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/skateboard-us-female.mp3 b/1000-hours/public/audios/us/skateboard-us-female.mp3
new file mode 100644
index 00000000..c21152e8
Binary files /dev/null and b/1000-hours/public/audios/us/skateboard-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/skateboard-us-male.mp3 b/1000-hours/public/audios/us/skateboard-us-male.mp3
new file mode 100644
index 00000000..1b1eaa28
Binary files /dev/null and b/1000-hours/public/audios/us/skateboard-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/slowly-us-female.mp3 b/1000-hours/public/audios/us/slowly-us-female.mp3
new file mode 100644
index 00000000..5be36242
Binary files /dev/null and b/1000-hours/public/audios/us/slowly-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/slowly-us-male.mp3 b/1000-hours/public/audios/us/slowly-us-male.mp3
new file mode 100644
index 00000000..c327d4b6
Binary files /dev/null and b/1000-hours/public/audios/us/slowly-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/snowflake-us-female.mp3 b/1000-hours/public/audios/us/snowflake-us-female.mp3
new file mode 100644
index 00000000..9e6f8bb4
Binary files /dev/null and b/1000-hours/public/audios/us/snowflake-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/snowflake-us-male.mp3 b/1000-hours/public/audios/us/snowflake-us-male.mp3
new file mode 100644
index 00000000..c7a21e18
Binary files /dev/null and b/1000-hours/public/audios/us/snowflake-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/spaceship-us-female.mp3 b/1000-hours/public/audios/us/spaceship-us-female.mp3
new file mode 100644
index 00000000..7ae61c43
Binary files /dev/null and b/1000-hours/public/audios/us/spaceship-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/spaceship-us-male.mp3 b/1000-hours/public/audios/us/spaceship-us-male.mp3
new file mode 100644
index 00000000..1d87c8e9
Binary files /dev/null and b/1000-hours/public/audios/us/spaceship-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/spectacle-us-female.mp3 b/1000-hours/public/audios/us/spectacle-us-female.mp3
new file mode 100644
index 00000000..01d47b43
Binary files /dev/null and b/1000-hours/public/audios/us/spectacle-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/spectacle-us-male.mp3 b/1000-hours/public/audios/us/spectacle-us-male.mp3
new file mode 100644
index 00000000..b2964a0a
Binary files /dev/null and b/1000-hours/public/audios/us/spectacle-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/spectator-us-female.mp3 b/1000-hours/public/audios/us/spectator-us-female.mp3
new file mode 100644
index 00000000..3fbb9212
Binary files /dev/null and b/1000-hours/public/audios/us/spectator-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/spectator-us-male.mp3 b/1000-hours/public/audios/us/spectator-us-male.mp3
new file mode 100644
index 00000000..13508672
Binary files /dev/null and b/1000-hours/public/audios/us/spectator-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/structure-us-female.mp3 b/1000-hours/public/audios/us/structure-us-female.mp3
new file mode 100644
index 00000000..bd9d08ed
Binary files /dev/null and b/1000-hours/public/audios/us/structure-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/structure-us-male.mp3 b/1000-hours/public/audios/us/structure-us-male.mp3
new file mode 100644
index 00000000..f9752225
Binary files /dev/null and b/1000-hours/public/audios/us/structure-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/subconscious-us-female.mp3 b/1000-hours/public/audios/us/subconscious-us-female.mp3
new file mode 100644
index 00000000..b916717f
Binary files /dev/null and b/1000-hours/public/audios/us/subconscious-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/subconscious-us-male.mp3 b/1000-hours/public/audios/us/subconscious-us-male.mp3
new file mode 100644
index 00000000..3ef18631
Binary files /dev/null and b/1000-hours/public/audios/us/subconscious-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/submarine-us-female.mp3 b/1000-hours/public/audios/us/submarine-us-female.mp3
new file mode 100644
index 00000000..1914aa1e
Binary files /dev/null and b/1000-hours/public/audios/us/submarine-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/submarine-us-male.mp3 b/1000-hours/public/audios/us/submarine-us-male.mp3
new file mode 100644
index 00000000..7a5ac514
Binary files /dev/null and b/1000-hours/public/audios/us/submarine-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/submit-us-female.mp3 b/1000-hours/public/audios/us/submit-us-female.mp3
new file mode 100644
index 00000000..da3f9f38
Binary files /dev/null and b/1000-hours/public/audios/us/submit-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/submit-us-male.mp3 b/1000-hours/public/audios/us/submit-us-male.mp3
new file mode 100644
index 00000000..975f26dd
Binary files /dev/null and b/1000-hours/public/audios/us/submit-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/subscription-us-female.mp3 b/1000-hours/public/audios/us/subscription-us-female.mp3
new file mode 100644
index 00000000..f8f9d6e1
Binary files /dev/null and b/1000-hours/public/audios/us/subscription-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/subscription-us-male.mp3 b/1000-hours/public/audios/us/subscription-us-male.mp3
new file mode 100644
index 00000000..81f1fbb8
Binary files /dev/null and b/1000-hours/public/audios/us/subscription-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/subtitle-us-female.mp3 b/1000-hours/public/audios/us/subtitle-us-female.mp3
new file mode 100644
index 00000000..dcb94934
Binary files /dev/null and b/1000-hours/public/audios/us/subtitle-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/subtitle-us-male.mp3 b/1000-hours/public/audios/us/subtitle-us-male.mp3
new file mode 100644
index 00000000..7499c467
Binary files /dev/null and b/1000-hours/public/audios/us/subtitle-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/suggestion-us-female.mp3 b/1000-hours/public/audios/us/suggestion-us-female.mp3
new file mode 100644
index 00000000..ebd60e01
Binary files /dev/null and b/1000-hours/public/audios/us/suggestion-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/suggestion-us-male.mp3 b/1000-hours/public/audios/us/suggestion-us-male.mp3
new file mode 100644
index 00000000..239fad96
Binary files /dev/null and b/1000-hours/public/audios/us/suggestion-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/sunflower-us-female.mp3 b/1000-hours/public/audios/us/sunflower-us-female.mp3
new file mode 100644
index 00000000..b6fc191b
Binary files /dev/null and b/1000-hours/public/audios/us/sunflower-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/sunflower-us-male.mp3 b/1000-hours/public/audios/us/sunflower-us-male.mp3
new file mode 100644
index 00000000..ee28e18d
Binary files /dev/null and b/1000-hours/public/audios/us/sunflower-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/sunshine-us-female.mp3 b/1000-hours/public/audios/us/sunshine-us-female.mp3
new file mode 100644
index 00000000..4700f7bc
Binary files /dev/null and b/1000-hours/public/audios/us/sunshine-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/sunshine-us-male.mp3 b/1000-hours/public/audios/us/sunshine-us-male.mp3
new file mode 100644
index 00000000..0a5ebf4c
Binary files /dev/null and b/1000-hours/public/audios/us/sunshine-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/superhero-us-female.mp3 b/1000-hours/public/audios/us/superhero-us-female.mp3
new file mode 100644
index 00000000..011be4e8
Binary files /dev/null and b/1000-hours/public/audios/us/superhero-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/superhero-us-male.mp3 b/1000-hours/public/audios/us/superhero-us-male.mp3
new file mode 100644
index 00000000..0a476c53
Binary files /dev/null and b/1000-hours/public/audios/us/superhero-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/superhuman-us-female.mp3 b/1000-hours/public/audios/us/superhuman-us-female.mp3
new file mode 100644
index 00000000..6ae72bf7
Binary files /dev/null and b/1000-hours/public/audios/us/superhuman-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/superhuman-us-male.mp3 b/1000-hours/public/audios/us/superhuman-us-male.mp3
new file mode 100644
index 00000000..65851fec
Binary files /dev/null and b/1000-hours/public/audios/us/superhuman-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/supermarket-us-female.mp3 b/1000-hours/public/audios/us/supermarket-us-female.mp3
new file mode 100644
index 00000000..4b2cec21
Binary files /dev/null and b/1000-hours/public/audios/us/supermarket-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/supermarket-us-male.mp3 b/1000-hours/public/audios/us/supermarket-us-male.mp3
new file mode 100644
index 00000000..a5f13fd2
Binary files /dev/null and b/1000-hours/public/audios/us/supermarket-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/supervisor-us-female.mp3 b/1000-hours/public/audios/us/supervisor-us-female.mp3
new file mode 100644
index 00000000..462def2d
Binary files /dev/null and b/1000-hours/public/audios/us/supervisor-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/supervisor-us-male.mp3 b/1000-hours/public/audios/us/supervisor-us-male.mp3
new file mode 100644
index 00000000..bc9f5b6a
Binary files /dev/null and b/1000-hours/public/audios/us/supervisor-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/suspend-us-female.mp3 b/1000-hours/public/audios/us/suspend-us-female.mp3
new file mode 100644
index 00000000..2c8de0e5
Binary files /dev/null and b/1000-hours/public/audios/us/suspend-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/suspend-us-male.mp3 b/1000-hours/public/audios/us/suspend-us-male.mp3
new file mode 100644
index 00000000..06586e35
Binary files /dev/null and b/1000-hours/public/audios/us/suspend-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/tablecloth-us-female.mp3 b/1000-hours/public/audios/us/tablecloth-us-female.mp3
new file mode 100644
index 00000000..09b19757
Binary files /dev/null and b/1000-hours/public/audios/us/tablecloth-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/tablecloth-us-male.mp3 b/1000-hours/public/audios/us/tablecloth-us-male.mp3
new file mode 100644
index 00000000..4de8648a
Binary files /dev/null and b/1000-hours/public/audios/us/tablecloth-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/telegraph-us-female.mp3 b/1000-hours/public/audios/us/telegraph-us-female.mp3
new file mode 100644
index 00000000..c963934d
Binary files /dev/null and b/1000-hours/public/audios/us/telegraph-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/telegraph-us-male.mp3 b/1000-hours/public/audios/us/telegraph-us-male.mp3
new file mode 100644
index 00000000..54927482
Binary files /dev/null and b/1000-hours/public/audios/us/telegraph-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/telephone-us-female.mp3 b/1000-hours/public/audios/us/telephone-us-female.mp3
new file mode 100644
index 00000000..3987f82a
Binary files /dev/null and b/1000-hours/public/audios/us/telephone-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/telephone-us-male.mp3 b/1000-hours/public/audios/us/telephone-us-male.mp3
new file mode 100644
index 00000000..e08e13e2
Binary files /dev/null and b/1000-hours/public/audios/us/telephone-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/television-us-female.mp3 b/1000-hours/public/audios/us/television-us-female.mp3
new file mode 100644
index 00000000..46e92c6c
Binary files /dev/null and b/1000-hours/public/audios/us/television-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/television-us-male.mp3 b/1000-hours/public/audios/us/television-us-male.mp3
new file mode 100644
index 00000000..7fd69a11
Binary files /dev/null and b/1000-hours/public/audios/us/television-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/terrain-us-female.mp3 b/1000-hours/public/audios/us/terrain-us-female.mp3
new file mode 100644
index 00000000..dc166b43
Binary files /dev/null and b/1000-hours/public/audios/us/terrain-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/terrain-us-male.mp3 b/1000-hours/public/audios/us/terrain-us-male.mp3
new file mode 100644
index 00000000..0278fa0d
Binary files /dev/null and b/1000-hours/public/audios/us/terrain-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/terrestrial-us-female.mp3 b/1000-hours/public/audios/us/terrestrial-us-female.mp3
new file mode 100644
index 00000000..5ab57963
Binary files /dev/null and b/1000-hours/public/audios/us/terrestrial-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/terrestrial-us-male.mp3 b/1000-hours/public/audios/us/terrestrial-us-male.mp3
new file mode 100644
index 00000000..cb402660
Binary files /dev/null and b/1000-hours/public/audios/us/terrestrial-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/territory-us-female.mp3 b/1000-hours/public/audios/us/territory-us-female.mp3
new file mode 100644
index 00000000..6e9ae1d9
Binary files /dev/null and b/1000-hours/public/audios/us/territory-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/territory-us-male.mp3 b/1000-hours/public/audios/us/territory-us-male.mp3
new file mode 100644
index 00000000..eafd752e
Binary files /dev/null and b/1000-hours/public/audios/us/territory-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/toothbrush-us-female.mp3 b/1000-hours/public/audios/us/toothbrush-us-female.mp3
new file mode 100644
index 00000000..26ef453b
Binary files /dev/null and b/1000-hours/public/audios/us/toothbrush-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/toothbrush-us-male.mp3 b/1000-hours/public/audios/us/toothbrush-us-male.mp3
new file mode 100644
index 00000000..51f8ad87
Binary files /dev/null and b/1000-hours/public/audios/us/toothbrush-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/toothpaste-us-female.mp3 b/1000-hours/public/audios/us/toothpaste-us-female.mp3
new file mode 100644
index 00000000..a57dab35
Binary files /dev/null and b/1000-hours/public/audios/us/toothpaste-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/toothpaste-us-male.mp3 b/1000-hours/public/audios/us/toothpaste-us-male.mp3
new file mode 100644
index 00000000..72b18574
Binary files /dev/null and b/1000-hours/public/audios/us/toothpaste-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/transfer-us-female.mp3 b/1000-hours/public/audios/us/transfer-us-female.mp3
new file mode 100644
index 00000000..314e0967
Binary files /dev/null and b/1000-hours/public/audios/us/transfer-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/transfer-us-male.mp3 b/1000-hours/public/audios/us/transfer-us-male.mp3
new file mode 100644
index 00000000..cbc671d6
Binary files /dev/null and b/1000-hours/public/audios/us/transfer-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/transform-us-female.mp3 b/1000-hours/public/audios/us/transform-us-female.mp3
new file mode 100644
index 00000000..8361aed4
Binary files /dev/null and b/1000-hours/public/audios/us/transform-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/transform-us-male.mp3 b/1000-hours/public/audios/us/transform-us-male.mp3
new file mode 100644
index 00000000..bc4f1d6a
Binary files /dev/null and b/1000-hours/public/audios/us/transform-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/transmit-us-female.mp3 b/1000-hours/public/audios/us/transmit-us-female.mp3
new file mode 100644
index 00000000..ccf2b326
Binary files /dev/null and b/1000-hours/public/audios/us/transmit-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/transmit-us-male.mp3 b/1000-hours/public/audios/us/transmit-us-male.mp3
new file mode 100644
index 00000000..8658dce4
Binary files /dev/null and b/1000-hours/public/audios/us/transmit-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/transport-us-female.mp3 b/1000-hours/public/audios/us/transport-us-female.mp3
new file mode 100644
index 00000000..37461aad
Binary files /dev/null and b/1000-hours/public/audios/us/transport-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/transport-us-male.mp3 b/1000-hours/public/audios/us/transport-us-male.mp3
new file mode 100644
index 00000000..3e2b22e8
Binary files /dev/null and b/1000-hours/public/audios/us/transport-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/transportation-us-female.mp3 b/1000-hours/public/audios/us/transportation-us-female.mp3
index 3e0823d9..046bde49 100644
Binary files a/1000-hours/public/audios/us/transportation-us-female.mp3 and b/1000-hours/public/audios/us/transportation-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/transportation-us-male.mp3 b/1000-hours/public/audios/us/transportation-us-male.mp3
index 50340438..703e32c6 100644
Binary files a/1000-hours/public/audios/us/transportation-us-male.mp3 and b/1000-hours/public/audios/us/transportation-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/typewriter-us-female.mp3 b/1000-hours/public/audios/us/typewriter-us-female.mp3
new file mode 100644
index 00000000..815ab31c
Binary files /dev/null and b/1000-hours/public/audios/us/typewriter-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/typewriter-us-male.mp3 b/1000-hours/public/audios/us/typewriter-us-male.mp3
new file mode 100644
index 00000000..cc24fe3a
Binary files /dev/null and b/1000-hours/public/audios/us/typewriter-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/underestimate-us-female.mp3 b/1000-hours/public/audios/us/underestimate-us-female.mp3
new file mode 100644
index 00000000..2355b34d
Binary files /dev/null and b/1000-hours/public/audios/us/underestimate-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/underestimate-us-male.mp3 b/1000-hours/public/audios/us/underestimate-us-male.mp3
new file mode 100644
index 00000000..a741a6db
Binary files /dev/null and b/1000-hours/public/audios/us/underestimate-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/underground-us-female.mp3 b/1000-hours/public/audios/us/underground-us-female.mp3
new file mode 100644
index 00000000..bb6cd53f
Binary files /dev/null and b/1000-hours/public/audios/us/underground-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/underground-us-male.mp3 b/1000-hours/public/audios/us/underground-us-male.mp3
new file mode 100644
index 00000000..d5979138
Binary files /dev/null and b/1000-hours/public/audios/us/underground-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/underpaid-us-female.mp3 b/1000-hours/public/audios/us/underpaid-us-female.mp3
new file mode 100644
index 00000000..b88e90b5
Binary files /dev/null and b/1000-hours/public/audios/us/underpaid-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/underpaid-us-male.mp3 b/1000-hours/public/audios/us/underpaid-us-male.mp3
new file mode 100644
index 00000000..daf1fad1
Binary files /dev/null and b/1000-hours/public/audios/us/underpaid-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/underwater-us-female.mp3 b/1000-hours/public/audios/us/underwater-us-female.mp3
new file mode 100644
index 00000000..a63bd659
Binary files /dev/null and b/1000-hours/public/audios/us/underwater-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/underwater-us-male.mp3 b/1000-hours/public/audios/us/underwater-us-male.mp3
new file mode 100644
index 00000000..885d591f
Binary files /dev/null and b/1000-hours/public/audios/us/underwater-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/unhappy-us-female.mp3 b/1000-hours/public/audios/us/unhappy-us-female.mp3
new file mode 100644
index 00000000..782d43b2
Binary files /dev/null and b/1000-hours/public/audios/us/unhappy-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/unhappy-us-male.mp3 b/1000-hours/public/audios/us/unhappy-us-male.mp3
new file mode 100644
index 00000000..31023b57
Binary files /dev/null and b/1000-hours/public/audios/us/unhappy-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/unknown-us-female.mp3 b/1000-hours/public/audios/us/unknown-us-female.mp3
new file mode 100644
index 00000000..f9e541f3
Binary files /dev/null and b/1000-hours/public/audios/us/unknown-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/unknown-us-male.mp3 b/1000-hours/public/audios/us/unknown-us-male.mp3
new file mode 100644
index 00000000..c9ce1e6e
Binary files /dev/null and b/1000-hours/public/audios/us/unknown-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/unusual-us-female.mp3 b/1000-hours/public/audios/us/unusual-us-female.mp3
new file mode 100644
index 00000000..a202d314
Binary files /dev/null and b/1000-hours/public/audios/us/unusual-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/unusual-us-male.mp3 b/1000-hours/public/audios/us/unusual-us-male.mp3
new file mode 100644
index 00000000..597dc9f7
Binary files /dev/null and b/1000-hours/public/audios/us/unusual-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/upstairs-us-female.mp3 b/1000-hours/public/audios/us/upstairs-us-female.mp3
new file mode 100644
index 00000000..ae85dfc4
Binary files /dev/null and b/1000-hours/public/audios/us/upstairs-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/upstairs-us-male.mp3 b/1000-hours/public/audios/us/upstairs-us-male.mp3
new file mode 100644
index 00000000..b5684058
Binary files /dev/null and b/1000-hours/public/audios/us/upstairs-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/vacant-us-female.mp3 b/1000-hours/public/audios/us/vacant-us-female.mp3
new file mode 100644
index 00000000..3568e704
Binary files /dev/null and b/1000-hours/public/audios/us/vacant-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/vacant-us-male.mp3 b/1000-hours/public/audios/us/vacant-us-male.mp3
new file mode 100644
index 00000000..0d16667b
Binary files /dev/null and b/1000-hours/public/audios/us/vacant-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/vacuum-us-female.mp3 b/1000-hours/public/audios/us/vacuum-us-female.mp3
new file mode 100644
index 00000000..97848fa4
Binary files /dev/null and b/1000-hours/public/audios/us/vacuum-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/vacuum-us-male.mp3 b/1000-hours/public/audios/us/vacuum-us-male.mp3
new file mode 100644
index 00000000..51c540e5
Binary files /dev/null and b/1000-hours/public/audios/us/vacuum-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/video-us-female.mp3 b/1000-hours/public/audios/us/video-us-female.mp3
new file mode 100644
index 00000000..cb18e56c
Binary files /dev/null and b/1000-hours/public/audios/us/video-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/video-us-male.mp3 b/1000-hours/public/audios/us/video-us-male.mp3
new file mode 100644
index 00000000..835e36e5
Binary files /dev/null and b/1000-hours/public/audios/us/video-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/visible-us-female.mp3 b/1000-hours/public/audios/us/visible-us-female.mp3
new file mode 100644
index 00000000..e329ef59
Binary files /dev/null and b/1000-hours/public/audios/us/visible-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/visible-us-male.mp3 b/1000-hours/public/audios/us/visible-us-male.mp3
new file mode 100644
index 00000000..25ef28e5
Binary files /dev/null and b/1000-hours/public/audios/us/visible-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/vision-us-male.mp3 b/1000-hours/public/audios/us/vision-us-male.mp3
index 41f484fe..b8ddeea6 100644
Binary files a/1000-hours/public/audios/us/vision-us-male.mp3 and b/1000-hours/public/audios/us/vision-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/volleyball-us-female.mp3 b/1000-hours/public/audios/us/volleyball-us-female.mp3
new file mode 100644
index 00000000..fb6e7706
Binary files /dev/null and b/1000-hours/public/audios/us/volleyball-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/volleyball-us-male.mp3 b/1000-hours/public/audios/us/volleyball-us-male.mp3
new file mode 100644
index 00000000..9ce72ba7
Binary files /dev/null and b/1000-hours/public/audios/us/volleyball-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/waterfall-us-female.mp3 b/1000-hours/public/audios/us/waterfall-us-female.mp3
new file mode 100644
index 00000000..ed3b9578
Binary files /dev/null and b/1000-hours/public/audios/us/waterfall-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/waterfall-us-male.mp3 b/1000-hours/public/audios/us/waterfall-us-male.mp3
new file mode 100644
index 00000000..5fd77e29
Binary files /dev/null and b/1000-hours/public/audios/us/waterfall-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/watermelon-us-female.mp3 b/1000-hours/public/audios/us/watermelon-us-female.mp3
new file mode 100644
index 00000000..ea9b3737
Binary files /dev/null and b/1000-hours/public/audios/us/watermelon-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/watermelon-us-male.mp3 b/1000-hours/public/audios/us/watermelon-us-male.mp3
new file mode 100644
index 00000000..38ef02d6
Binary files /dev/null and b/1000-hours/public/audios/us/watermelon-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/weekend-us-female.mp3 b/1000-hours/public/audios/us/weekend-us-female.mp3
new file mode 100644
index 00000000..8890d317
Binary files /dev/null and b/1000-hours/public/audios/us/weekend-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/weekend-us-male.mp3 b/1000-hours/public/audios/us/weekend-us-male.mp3
new file mode 100644
index 00000000..aec29634
Binary files /dev/null and b/1000-hours/public/audios/us/weekend-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/wheelchair-us-female.mp3 b/1000-hours/public/audios/us/wheelchair-us-female.mp3
new file mode 100644
index 00000000..36423d88
Binary files /dev/null and b/1000-hours/public/audios/us/wheelchair-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/wheelchair-us-male.mp3 b/1000-hours/public/audios/us/wheelchair-us-male.mp3
new file mode 100644
index 00000000..23758638
Binary files /dev/null and b/1000-hours/public/audios/us/wheelchair-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/windmill-us-female.mp3 b/1000-hours/public/audios/us/windmill-us-female.mp3
new file mode 100644
index 00000000..0e241ddd
Binary files /dev/null and b/1000-hours/public/audios/us/windmill-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/windmill-us-male.mp3 b/1000-hours/public/audios/us/windmill-us-male.mp3
new file mode 100644
index 00000000..86ca7198
Binary files /dev/null and b/1000-hours/public/audios/us/windmill-us-male.mp3 differ
diff --git a/1000-hours/public/audios/us/workshop-us-female.mp3 b/1000-hours/public/audios/us/workshop-us-female.mp3
new file mode 100644
index 00000000..63b5136d
Binary files /dev/null and b/1000-hours/public/audios/us/workshop-us-female.mp3 differ
diff --git a/1000-hours/public/audios/us/workshop-us-male.mp3 b/1000-hours/public/audios/us/workshop-us-male.mp3
new file mode 100644
index 00000000..245e39aa
Binary files /dev/null and b/1000-hours/public/audios/us/workshop-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/admit-us-female.mp3 b/1000-hours/public/jupyter-notebooks/admit-us-female.mp3
new file mode 100644
index 00000000..3bf829b3
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/admit-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/admit-us-male.mp3 b/1000-hours/public/jupyter-notebooks/admit-us-male.mp3
new file mode 100644
index 00000000..38a80fd6
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/admit-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/aquarium-us-female.mp3 b/1000-hours/public/jupyter-notebooks/aquarium-us-female.mp3
new file mode 100644
index 00000000..c9d25a91
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/aquarium-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/aquarium-us-male.mp3 b/1000-hours/public/jupyter-notebooks/aquarium-us-male.mp3
new file mode 100644
index 00000000..b93308f6
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/aquarium-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/aquatic-us-female.mp3 b/1000-hours/public/jupyter-notebooks/aquatic-us-female.mp3
new file mode 100644
index 00000000..2c343742
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/aquatic-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/aquatic-us-male.mp3 b/1000-hours/public/jupyter-notebooks/aquatic-us-male.mp3
new file mode 100644
index 00000000..08aa0210
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/aquatic-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/aqueduct-us-female.mp3 b/1000-hours/public/jupyter-notebooks/aqueduct-us-female.mp3
new file mode 100644
index 00000000..95022be6
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/aqueduct-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/aqueduct-us-male.mp3 b/1000-hours/public/jupyter-notebooks/aqueduct-us-male.mp3
new file mode 100644
index 00000000..128734ff
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/aqueduct-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/audience-us-female.mp3 b/1000-hours/public/jupyter-notebooks/audience-us-female.mp3
new file mode 100644
index 00000000..6eed7919
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/audience-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/audience-us-male.mp3 b/1000-hours/public/jupyter-notebooks/audience-us-male.mp3
new file mode 100644
index 00000000..d533e0c0
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/audience-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/audio-us-female.mp3 b/1000-hours/public/jupyter-notebooks/audio-us-female.mp3
new file mode 100644
index 00000000..3b45960e
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/audio-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/audio-us-male.mp3 b/1000-hours/public/jupyter-notebooks/audio-us-male.mp3
new file mode 100644
index 00000000..8e0175a1
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/audio-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/audition-us-female.mp3 b/1000-hours/public/jupyter-notebooks/audition-us-female.mp3
new file mode 100644
index 00000000..6886d855
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/audition-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/audition-us-male.mp3 b/1000-hours/public/jupyter-notebooks/audition-us-male.mp3
new file mode 100644
index 00000000..3b03c341
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/audition-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/benefactor-us-female.mp3 b/1000-hours/public/jupyter-notebooks/benefactor-us-female.mp3
new file mode 100644
index 00000000..b0e42a5f
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/benefactor-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/benefactor-us-male.mp3 b/1000-hours/public/jupyter-notebooks/benefactor-us-male.mp3
new file mode 100644
index 00000000..8157b4fa
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/benefactor-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/benefit-us-female.mp3 b/1000-hours/public/jupyter-notebooks/benefit-us-female.mp3
new file mode 100644
index 00000000..3547a4cc
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/benefit-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/benefit-us-male.mp3 b/1000-hours/public/jupyter-notebooks/benefit-us-male.mp3
new file mode 100644
index 00000000..72d84640
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/benefit-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/benevolent-us-female.mp3 b/1000-hours/public/jupyter-notebooks/benevolent-us-female.mp3
new file mode 100644
index 00000000..5981c0d1
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/benevolent-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/benevolent-us-male.mp3 b/1000-hours/public/jupyter-notebooks/benevolent-us-male.mp3
new file mode 100644
index 00000000..4684c3d1
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/benevolent-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/centennial-us-female.mp3 b/1000-hours/public/jupyter-notebooks/centennial-us-female.mp3
new file mode 100644
index 00000000..c1fea423
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/centennial-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/centennial-us-male.mp3 b/1000-hours/public/jupyter-notebooks/centennial-us-male.mp3
new file mode 100644
index 00000000..a1927056
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/centennial-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/century-us-female.mp3 b/1000-hours/public/jupyter-notebooks/century-us-female.mp3
new file mode 100644
index 00000000..3ff008c3
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/century-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/century-us-male.mp3 b/1000-hours/public/jupyter-notebooks/century-us-male.mp3
new file mode 100644
index 00000000..ba0ca320
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/century-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/chapter4.ipynb b/1000-hours/public/jupyter-notebooks/chapter4.ipynb
new file mode 100644
index 00000000..620d75c7
--- /dev/null
+++ b/1000-hours/public/jupyter-notebooks/chapter4.ipynb
@@ -0,0 +1,420 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import sys\n",
+    "import requests\n",
+    "import json\n",
+    "import vlc\n",
+    "import re\n",
+    "import random\n",
+    "from IPython.display import Audio\n",
+    "\n",
+    "def load_json_database(url):\n",
+    "    records = []\n",
+    "    try:\n",
+    "        response = requests.get(url)\n",
+    "        response.raise_for_status()  # Raise an error for bad status codes\n",
+    "        for line in response.iter_lines(decode_unicode=True):\n",
+    "            if line:\n",
+    "                try:\n",
+    "                    record = json.loads(line)\n",
+    "                    records.append(record)\n",
+    "                except json.JSONDecodeError as e:\n",
+    "                    print(f\"Error parsing JSON: {e}\")\n",
+    "    except requests.exceptions.RequestException as e:\n",
+    "        print(f\"Error fetching data from URL: {e}\")\n",
+    "    return records\n",
+    "\n",
+    "def search_in_json_database(database, search_word, region):\n",
+    "    for record in database:\n",
+    "        # 检查 word 字段是否匹配\n",
+    "        if record.get('word') == search_word:\n",
+    "            # 找到匹配项后，获取美式发音信息\n",
+    "            pos_items = record.get('pos_items', [])\n",
+    "            for pos_item in pos_items:\n",
+    "                pronunciations = pos_item.get('pronunciations', [])\n",
+    "                for pronunciation in pronunciations:\n",
+    "                    if pronunciation.get('region') == region:\n",
+    "                        # 找到美式发音，返回相关信息\n",
+    "                        return {\n",
+    "                            'pronunciation': pronunciation.get('pronunciation'),\n",
+    "                            'audio': pronunciation.get('audio')\n",
+    "                        }\n",
+    "    # 如果没有找到匹配的 word 字段，返回 'not exist'\n",
+    "    return 'not exist'\n",
+    "\n",
+    "url = \"https://raw.githubusercontent.com/zelic91/camdict/main/cam_dict.refined.json\"\n",
+    "\n",
+    "json_database = load_json_database(url)\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "之前讲过，非重音音节里的元音可能会被弱化为 schwa <span class=\"pho\">ə</span>…… 在自然语流中，连 schwa <span class=\"pho\">ə</span> 都可能会被进一步弱化，变成非常轻的 <span class=\"pho\">ɤ</span>。比如，常用词 reasonable，</span>/ˈriːzənəbəl/</span>，实际听到的常常是</span> /ˈriːzɤnəbəl/</span>……\n",
+      "\n",
+      "phonetics_not_exist: \n",
+      "\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "text =\"\"\"\n",
+    "之前讲过，非重音音节里的元音可能会被弱化为 schwa `ə`…… 在自然语流中，连 schwa `ə` 都可能会被进一步弱化，变成非常轻的 `ɤ`。比如，常用词 reasonable，`/ˈriːzənəbəl/`，实际听到的常常是` /ˈriːzɤnəbəl/`……\n",
+    "\"\"\"\n",
+    "\n",
+    "words = \"\"\n",
+    "phonetics_not_exist = ''\n",
+    "lines = text.split(\"\\n\")\n",
+    "for line in lines:\n",
+    "    line = line.replace(\" `\", \" <span class=\\\"pho\\\">\")\n",
+    "    line = line.replace(\"`\", \"</span>\")\n",
+    "    if '*' in line:\n",
+    "        line = line.replace('\"', \"**\")\n",
+    "        examples = line.split(\"-\")[1].split(\",\")\n",
+    "        examples = [x.strip() for x in examples]\n",
+    "        line = line.replace(\" - \", \"\\n\")\n",
+    "        # print(examples)\n",
+    "        # wrap examples in span,\n",
+    "        for e in examples:\n",
+    "            # join e in words with ','\n",
+    "            words += e + \",\"\n",
+    "            entry_us = search_in_json_database(json_database, e, 'us')\n",
+    "            if entry_us == 'not exist':\n",
+    "                phonetics = entry_us\n",
+    "                phonetics_not_exist += f'{e},'\n",
+    "            else:\n",
+    "                phonetics = entry_us['pronunciation']    \n",
+    "            wrapped_e = f'\\t- {e} <span class=\"pho alt\">{phonetics}</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/{e}-us-male.mp3\" data-audio-us-female=\"/audios/us/{e}-us-female.mp3\"></span>\\n'\n",
+    "            line = line.replace(e, wrapped_e).replace(',', '').strip()\n",
+    "            \n",
+    "\n",
+    "    print(line)\n",
+    "print(f'phonetics_not_exist: {phonetics_not_exist}')\n",
+    "print('\\n'+words)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['reasonable']\n",
+      "reasonable\n",
+      "Files created!\n"
+     ]
+    }
+   ],
+   "source": [
+    "import asyncio\n",
+    "import edge_tts\n",
+    "import pygame\n",
+    "text = words.rstrip(\",\")\n",
+    "Wordlist = text.split(\",\")\n",
+    "# Wordlist = ['reasonable']\n",
+    "\n",
+    "print(Wordlist)\n",
+    "for w in Wordlist:\n",
+    "  # for VOICE in ['en-US-GuyNeural', 'en-US-JennyNeural', 'en-GB-RyanNeural', 'en-GB-SoniaNeural']:\n",
+    "  for VOICE in ['en-US-GuyNeural', 'en-US-MichelleNeural']:\n",
+    "    w = w.strip()\n",
+    "    # OUTPUT_FILE = f\"{w}-{VOICE.replace('EricNeural', 'Guy-Male').replace('JennyNeural', 'Jenny-Female').replace('RyanNeural', 'Ryan-Male').replace('SoniaNeural', 'Sonia-Female').lower()}.mp3\"\n",
+    "    OUTPUT_FILE = f\"{w}-{VOICE.replace('GuyNeural', 'Male').replace('MichelleNeural', 'Female').replace('en-', '').lower()}.mp3\"\n",
+    "    communicate = edge_tts.Communicate(w, VOICE)\n",
+    "    await communicate.save(OUTPUT_FILE) \n",
+    "  print(w)\n",
+    "print(\"Files created!\") "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 24,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "举个例子，*ichthyosaur*，这个一看就知道并非常用的词汇，其实很简单，先从表音构成去看，<span class=\"pho alt\">ˈɪk.θi.ə.sɔːr</span> —— 剑桥词典把它划分成了 4 个音节…… 但感觉上，第二第三个音节可以合并，<span class=\"pho alt\">ˈɪk.θiə.sɔːr</span>，*ich* ⭤ <span class=\"pho alt\">ˈɪk</span>, *thyo* ⭤ <span class=\"pho alt\">θiə</span>, *saur* ⭤ <span class=\"pho alt\">sɔːr</span>…… 而从表意的角度去看呢？前半部 *ichthyo-* 的意思是 “与鱼有关的”…… 后半部 *-saur* 是什么意思呢？各种恐龙的 “龙” 都是 -saur 结尾，于是，这个词的意思是 “鱼龙”…… 换言之，这个单词的两个部分，都是拉丁词根词缀，也都是 “既表音又表意” 的，事实上很简单 —— 虽然拼写乍看起来很复杂。\n",
+      "\n",
+      "Audio files for ichthyosaur created!\n",
+      "\n",
+      "举个例子，*ichthyosaur* <span class=\"pho alt\">ˈɪk.θi.ə.sɔːr</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/ichthyosaur-us-male.mp3\" data-audio-us-female=\"/audios/us/ichthyosaur-us-female.mp3\"></span>\n",
+      "，这个一看就知道并非常用的词汇，其实很简单，先从表音构成去看，<span class=\"pho alt\">ˈɪk.θi.ə.sɔːr</span> —— 剑桥词典把它划分成了 4 个音节…… 但感觉上，第二第三个音节可以合并，<span class=\"pho alt\">ˈɪk.θiə.sɔːr</span>，*ich* ⭤ <span class=\"pho alt\">ˈɪk</span>, *thyo* ⭤ <span class=\"pho alt\">θiə</span>, *saur* ⭤ <span class=\"pho alt\">sɔːr</span>…… 而从表意的角度去看呢？前半部 *ichthyo-* 的意思是 “与鱼有关的”…… 后半部 *-saur* 是什么意思呢？各种恐龙的 “龙” 都是 -saur 结尾，于是，这个词的意思是 “鱼龙”…… 换言之，这个单词的两个部分，都是拉丁词根词缀，也都是 “既表音又表意” 的，事实上很简单 —— 虽然拼写乍看起来很复杂。\n",
+      "\n",
+      "Text copied to clipboard!\n"
+     ]
+    }
+   ],
+   "source": [
+    "text =\"\"\"\n",
+    "举个例子，*ichthyosaur*，这个一看就知道并非常用的词汇，其实很简单，先从表音构成去看，`/ˈɪk.θi.ə.sɔːr/` —— 剑桥词典把它划分成了 4 个音节…… 但感觉上，第二第三个音节可以合并，`/ˈɪk.θiə.sɔːr/`，*ich* ⭤ `/ˈɪk/`, *thyo* ⭤ `/θiə/`, *saur* ⭤ `/sɔːr/`…… 而从表意的角度去看呢？前半部 *ichthyo-* 的意思是 “与鱼有关的”…… 后半部 *-saur* 是什么意思呢？各种恐龙的 “龙” 都是 -saur 结尾，于是，这个词的意思是 “鱼龙”…… 换言之，这个单词的两个部分，都是拉丁词根词缀，也都是 “既表音又表意” 的，事实上很简单 —— 虽然拼写乍看起来很复杂。\n",
+    "\"\"\"\n",
+    "\n",
+    "sound_files = \"ichthyosaur\".split(\",\")\n",
+    "# regex, replace `...` with <span class=\"pho\">...</span>\n",
+    "import re\n",
+    "text = text.replace(\"/\", \"\")\n",
+    "text = re.sub(r'`([^`]+)`', r'<span class=\"pho alt\">\\1</span>', text)\n",
+    "print(text)\n",
+    "\n",
+    "# get sound files\n",
+    "for s in sound_files:\n",
+    "    w = s.strip()\n",
+    "    text = text.replace(f\"*{w}*\", w)\n",
+    "    # get the audio file\n",
+    "\n",
+    "    import asyncio\n",
+    "    import edge_tts\n",
+    "    import pygame\n",
+    "    for VOICE in ['en-US-GuyNeural', 'en-US-MichelleNeural']:\n",
+    "        # OUTPUT_FILE = f\"{w}-{VOICE.replace('EricNeural', 'Guy-Male').replace('JennyNeural', 'Jenny-Female').replace('RyanNeural', 'Ryan-Male').replace('SoniaNeural', 'Sonia-Female').lower()}.mp3\"\n",
+    "        OUTPUT_FILE = f\"{w}-{VOICE.replace('GuyNeural', 'Male').replace('MichelleNeural', 'Female').replace('en-', '').lower()}.mp3\"\n",
+    "        communicate = edge_tts.Communicate(w, VOICE)\n",
+    "        await communicate.save(OUTPUT_FILE) \n",
+    "    print(f\"Audio files for {w} created!\") \n",
+    "\n",
+    "    entry_us = search_in_json_database(json_database, w, 'us')\n",
+    "    if entry_us == 'not exist':\n",
+    "        phonetics = entry_us\n",
+    "    else:\n",
+    "        phonetics = entry_us['pronunciation']    \n",
+    "    wrapped_w = f'*{w}* <span class=\"pho alt\">{phonetics}</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/{w}-us-male.mp3\" data-audio-us-female=\"/audios/us/{w}-us-female.mp3\"></span>\\n'\n",
+    "    text = text.replace(w, wrapped_w)\n",
+    "    # get phonetics for the word\n",
+    "\n",
+    "print(text)\n",
+    "\n",
+    "# send text to clipboard\n",
+    "import pyperclip\n",
+    "pyperclip.copy(text.replace(\"\\n\", \"\"))\n",
+    "print(\"Text copied to clipboard!\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 20,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Collecting pyperclip\n",
+      "  Downloading pyperclip-1.9.0.tar.gz (20 kB)\n",
+      "  Preparing metadata (setup.py) ... \u001b[?25ldone\n",
+      "\u001b[?25hBuilding wheels for collected packages: pyperclip\n",
+      "  Building wheel for pyperclip (setup.py) ... \u001b[?25ldone\n",
+      "\u001b[?25h  Created wheel for pyperclip: filename=pyperclip-1.9.0-py3-none-any.whl size=11002 sha256=b07922d96d27e2cc0dce4f31dd18f85c90c5f4b9298ca359a6ad9a13494461d6\n",
+      "  Stored in directory: /Users/joker/Library/Caches/pip/wheels/e0/e8/fc/8ab8aa326e33bc066ccd5f3ca9646eab4299881af933f94f09\n",
+      "Successfully built pyperclip\n",
+      "Installing collected packages: pyperclip\n",
+      "Successfully installed pyperclip-1.9.0\n"
+     ]
+    }
+   ],
+   "source": [
+    "!pip install pyperclip"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 29,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "1. **airplane** <span class=\"pho alt\">ˈer.pleɪn</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/airplane-us-male.mp3\" data-audio-us-female=\"/audios/us/airplane-us-female.mp3\"></span>\n",
+      "2. **airport** <span class=\"pho alt\">ˈer.pɔːrt</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/airport-us-male.mp3\" data-audio-us-female=\"/audios/us/airport-us-female.mp3\"></span>\n",
+      "3. **backyard** <span class=\"pho alt\">ˌbækˈjɑːrd</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/backyard-us-male.mp3\" data-audio-us-female=\"/audios/us/backyard-us-female.mp3\"></span>\n",
+      "4. **bedroom** <span class=\"pho alt\">ˈbed.ruːm</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/bedroom-us-male.mp3\" data-audio-us-female=\"/audios/us/bedroom-us-female.mp3\"></span>\n",
+      "5. **birthday** <span class=\"pho alt\">ˈbɝːθ.deɪ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/birthday-us-male.mp3\" data-audio-us-female=\"/audios/us/birthday-us-female.mp3\"></span>\n",
+      "6. **blackboard** <span class=\"pho alt\">ˈblæk.bɔːrd</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/blackboard-us-male.mp3\" data-audio-us-female=\"/audios/us/blackboard-us-female.mp3\"></span>\n",
+      "7. **bookstore** <span class=\"pho alt\">ˈbʊk.stɔːr</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/bookstore-us-male.mp3\" data-audio-us-female=\"/audios/us/bookstore-us-female.mp3\"></span>\n",
+      "8. **brainstorm** <span class=\"pho alt\">ˈbreɪn.stɔːrm</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/brainstorm-us-male.mp3\" data-audio-us-female=\"/audios/us/brainstorm-us-female.mp3\"></span>\n",
+      "9. **breakfast** <span class=\"pho alt\">ˈbrek.fəst</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/breakfast-us-male.mp3\" data-audio-us-female=\"/audios/us/breakfast-us-female.mp3\"></span>\n",
+      "10. **classroom** <span class=\"pho alt\">ˈklæs.ruːm</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/classroom-us-male.mp3\" data-audio-us-female=\"/audios/us/classroom-us-female.mp3\"></span>\n",
+      "11. **cupcake** <span class=\"pho alt\">ˈkʌp.keɪk</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/cupcake-us-male.mp3\" data-audio-us-female=\"/audios/us/cupcake-us-female.mp3\"></span>\n",
+      "12. **daydream** <span class=\"pho alt\">ˈdeɪ.driːm</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/daydream-us-male.mp3\" data-audio-us-female=\"/audios/us/daydream-us-female.mp3\"></span>\n",
+      "13. **dishwasher** <span class=\"pho alt\">ˈdɪʃˌwɑː.ʃɚ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/dishwasher-us-male.mp3\" data-audio-us-female=\"/audios/us/dishwasher-us-female.mp3\"></span>\n",
+      "14. **doorbell** <span class=\"pho alt\">ˈdɔːr.bel</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/doorbell-us-male.mp3\" data-audio-us-female=\"/audios/us/doorbell-us-female.mp3\"></span>\n",
+      "15. **downtown** <span class=\"pho alt\">ˌdaʊnˈtaʊn</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/downtown-us-male.mp3\" data-audio-us-female=\"/audios/us/downtown-us-female.mp3\"></span>\n",
+      "16. **earthquake** <span class=\"pho alt\">ˈɝːθ.kweɪk</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/earthquake-us-male.mp3\" data-audio-us-female=\"/audios/us/earthquake-us-female.mp3\"></span>\n",
+      "17. **everyday** <span class=\"pho alt\">ˈev.ri.deɪ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/everyday-us-male.mp3\" data-audio-us-female=\"/audios/us/everyday-us-female.mp3\"></span>\n",
+      "18. **eyewitness** <span class=\"pho alt\">ˈaɪˌwɪt.nəs</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/eyewitness-us-male.mp3\" data-audio-us-female=\"/audios/us/eyewitness-us-female.mp3\"></span>\n",
+      "19. **firefighter** <span class=\"pho alt\">ˈfaɪrˌfaɪ.t̬ɚ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/firefighter-us-male.mp3\" data-audio-us-female=\"/audios/us/firefighter-us-female.mp3\"></span>\n",
+      "20. **football** <span class=\"pho alt\">ˈfʊt.bɑːl</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/football-us-male.mp3\" data-audio-us-female=\"/audios/us/football-us-female.mp3\"></span>\n",
+      "21. **greenhouse** <span class=\"pho alt\">ˈɡriːn.haʊs</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/greenhouse-us-male.mp3\" data-audio-us-female=\"/audios/us/greenhouse-us-female.mp3\"></span>\n",
+      "22. **handwriting** <span class=\"pho alt\">ˈhændˌraɪ.t̬ɪŋ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/handwriting-us-male.mp3\" data-audio-us-female=\"/audios/us/handwriting-us-female.mp3\"></span>\n",
+      "23. **headache** <span class=\"pho alt\">ˈhed.eɪk</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/headache-us-male.mp3\" data-audio-us-female=\"/audios/us/headache-us-female.mp3\"></span>\n",
+      "24. **highway** <span class=\"pho alt\">ˈhaɪ.weɪ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/highway-us-male.mp3\" data-audio-us-female=\"/audios/us/highway-us-female.mp3\"></span>\n",
+      "25. **homework** <span class=\"pho alt\">ˈhoʊm.wɝːk</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/homework-us-male.mp3\" data-audio-us-female=\"/audios/us/homework-us-female.mp3\"></span>\n",
+      "26. **iceberg** <span class=\"pho alt\">ˈaɪs.bɝːɡ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/iceberg-us-male.mp3\" data-audio-us-female=\"/audios/us/iceberg-us-female.mp3\"></span>\n",
+      "27. **jellyfish** <span class=\"pho alt\">ˈdʒel.i.fɪʃ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/jellyfish-us-male.mp3\" data-audio-us-female=\"/audios/us/jellyfish-us-female.mp3\"></span>\n",
+      "28. **laptop** <span class=\"pho alt\">ˈlæp.tɑːp</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/laptop-us-male.mp3\" data-audio-us-female=\"/audios/us/laptop-us-female.mp3\"></span>\n",
+      "29. **lighthouse** <span class=\"pho alt\">ˈlaɪt.haʊs</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/lighthouse-us-male.mp3\" data-audio-us-female=\"/audios/us/lighthouse-us-female.mp3\"></span>\n",
+      "30. **mailbox** <span class=\"pho alt\">ˈmeɪl.bɑːks</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/mailbox-us-male.mp3\" data-audio-us-female=\"/audios/us/mailbox-us-female.mp3\"></span>\n",
+      "31. **moonlight** <span class=\"pho alt\">ˈmuːn.laɪt</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/moonlight-us-male.mp3\" data-audio-us-female=\"/audios/us/moonlight-us-female.mp3\"></span>\n",
+      "32. **notebook** <span class=\"pho alt\">ˈnoʊt.bʊk</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/notebook-us-male.mp3\" data-audio-us-female=\"/audios/us/notebook-us-female.mp3\"></span>\n",
+      "33. **nobody** <span class=\"pho alt\">ˈnoʊ.bɑː.di</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/nobody-us-male.mp3\" data-audio-us-female=\"/audios/us/nobody-us-female.mp3\"></span>\n",
+      "34. **pancake** <span class=\"pho alt\">ˈpæn.keɪk</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/pancake-us-male.mp3\" data-audio-us-female=\"/audios/us/pancake-us-female.mp3\"></span>\n",
+      "35. **postcard** <span class=\"pho alt\">ˈpoʊst.kɑːrd</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/postcard-us-male.mp3\" data-audio-us-female=\"/audios/us/postcard-us-female.mp3\"></span>\n",
+      "36. **rainbow** <span class=\"pho alt\">ˈreɪn.boʊ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/rainbow-us-male.mp3\" data-audio-us-female=\"/audios/us/rainbow-us-female.mp3\"></span>\n",
+      "37. **sailboat** <span class=\"pho alt\">ˈseɪl.boʊt</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/sailboat-us-male.mp3\" data-audio-us-female=\"/audios/us/sailboat-us-female.mp3\"></span>\n",
+      "38. **sandbox** <span class=\"pho alt\">ˈsænd.bɑːks</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/sandbox-us-male.mp3\" data-audio-us-female=\"/audios/us/sandbox-us-female.mp3\"></span>\n",
+      "39. **seashore** <span class=\"pho alt\">ˈsiː.ʃɔːr</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/seashore-us-male.mp3\" data-audio-us-female=\"/audios/us/seashore-us-female.mp3\"></span>\n",
+      "40. **skateboard** <span class=\"pho alt\">ˈskeɪt.bɔːrd</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/skateboard-us-male.mp3\" data-audio-us-female=\"/audios/us/skateboard-us-female.mp3\"></span>\n",
+      "41. **snowflake** <span class=\"pho alt\">ˈsnoʊ.fleɪk</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/snowflake-us-male.mp3\" data-audio-us-female=\"/audios/us/snowflake-us-female.mp3\"></span>\n",
+      "42. **spaceship** <span class=\"pho alt\">ˈspeɪs.ʃɪp</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/spaceship-us-male.mp3\" data-audio-us-female=\"/audios/us/spaceship-us-female.mp3\"></span>\n",
+      "43. **sunflower** <span class=\"pho alt\">ˈsʌnˌflaʊ.ɚ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/sunflower-us-male.mp3\" data-audio-us-female=\"/audios/us/sunflower-us-female.mp3\"></span>\n",
+      "44. **sunshine** <span class=\"pho alt\">ˈsʌn.ʃaɪn</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/sunshine-us-male.mp3\" data-audio-us-female=\"/audios/us/sunshine-us-female.mp3\"></span>\n",
+      "45. **superhero** <span class=\"pho alt\">ˈsuː.pɚˌhɪr.oʊ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/superhero-us-male.mp3\" data-audio-us-female=\"/audios/us/superhero-us-female.mp3\"></span>\n",
+      "46. **tablecloth** <span class=\"pho alt\">ˈteɪ.bəl.klɑːθ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/tablecloth-us-male.mp3\" data-audio-us-female=\"/audios/us/tablecloth-us-female.mp3\"></span>\n",
+      "47. **toothbrush** <span class=\"pho alt\">ˈtuːθ.brʌʃ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/toothbrush-us-male.mp3\" data-audio-us-female=\"/audios/us/toothbrush-us-female.mp3\"></span>\n",
+      "48. **toothpaste** <span class=\"pho alt\">ˈtuːθ.peɪst</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/toothpaste-us-male.mp3\" data-audio-us-female=\"/audios/us/toothpaste-us-female.mp3\"></span>\n",
+      "49. **typewriter** <span class=\"pho alt\">ˈtaɪpˌraɪ.t̬ɚ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/typewriter-us-male.mp3\" data-audio-us-female=\"/audios/us/typewriter-us-female.mp3\"></span>\n",
+      "50. **underwater** <span class=\"pho alt\">ˌʌn.dɚˈwɑː.t̬ɚ</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/underwater-us-male.mp3\" data-audio-us-female=\"/audios/us/underwater-us-female.mp3\"></span>\n",
+      "51. **upstairs** <span class=\"pho alt\">ʌpˈsterz</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/upstairs-us-male.mp3\" data-audio-us-female=\"/audios/us/upstairs-us-female.mp3\"></span>\n",
+      "52. **volleyball** <span class=\"pho alt\">ˈvɑː.li.bɑːl</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/volleyball-us-male.mp3\" data-audio-us-female=\"/audios/us/volleyball-us-female.mp3\"></span>\n",
+      "53. **waterfall** <span class=\"pho alt\">ˈwɑː.t̬ɚ.fɑːl</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/waterfall-us-male.mp3\" data-audio-us-female=\"/audios/us/waterfall-us-female.mp3\"></span>\n",
+      "54. **watermelon** <span class=\"pho alt\">ˈwɑː.t̬ɚˌmel.ən</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/watermelon-us-male.mp3\" data-audio-us-female=\"/audios/us/watermelon-us-female.mp3\"></span>\n",
+      "55. **weekend** <span class=\"pho alt\">ˈwiːk.end</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/weekend-us-male.mp3\" data-audio-us-female=\"/audios/us/weekend-us-female.mp3\"></span>\n",
+      "56. **wheelchair** <span class=\"pho alt\">ˈwiːl.tʃer</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/wheelchair-us-male.mp3\" data-audio-us-female=\"/audios/us/wheelchair-us-female.mp3\"></span>\n",
+      "57. **windmill** <span class=\"pho alt\">ˈwɪnd.mɪl</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/windmill-us-male.mp3\" data-audio-us-female=\"/audios/us/windmill-us-female.mp3\"></span>\n",
+      "58. **workshop** <span class=\"pho alt\">ˈwɝːk.ʃɑːp</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/workshop-us-male.mp3\" data-audio-us-female=\"/audios/us/workshop-us-female.mp3\"></span>\n"
+     ]
+    }
+   ],
+   "source": [
+    "list = \"\"\"\n",
+    "1. **airplane**\n",
+    "2. **airport**\n",
+    "3. **backyard**\n",
+    "4. **bedroom**\n",
+    "5. **birthday**\n",
+    "6. **blackboard**\n",
+    "7. **bookstore**\n",
+    "8. **brainstorm**\n",
+    "9. **breakfast**\n",
+    "10. **classroom**\n",
+    "11. **cupcake**\n",
+    "12. **daydream**\n",
+    "13. **dishwasher**\n",
+    "14. **doorbell**\n",
+    "15. **downtown**\n",
+    "16. **earthquake**\n",
+    "17. **everyday**\n",
+    "18. **eyewitness**\n",
+    "19. **firefighter**\n",
+    "20. **football**\n",
+    "21. **greenhouse**\n",
+    "22. **handwriting**\n",
+    "23. **headache**\n",
+    "24. **highway**\n",
+    "25. **homework**\n",
+    "26. **iceberg**\n",
+    "27. **jellyfish**\n",
+    "28. **laptop**\n",
+    "29. **lighthouse**\n",
+    "30. **mailbox**\n",
+    "31. **moonlight**\n",
+    "32. **notebook**\n",
+    "33. **nobody**\n",
+    "34. **pancake**\n",
+    "35. **postcard**\n",
+    "36. **rainbow**\n",
+    "37. **sailboat**\n",
+    "38. **sandbox**\n",
+    "39. **seashore**\n",
+    "40. **skateboard**\n",
+    "41. **snowflake**\n",
+    "42. **spaceship**\n",
+    "43. **sunflower**\n",
+    "44. **sunshine**\n",
+    "45. **superhero**\n",
+    "46. **tablecloth**\n",
+    "47. **toothbrush**\n",
+    "48. **toothpaste**\n",
+    "49. **typewriter**\n",
+    "50. **underwater**\n",
+    "51. **upstairs**\n",
+    "52. **volleyball**\n",
+    "53. **waterfall**\n",
+    "54. **watermelon**\n",
+    "55. **weekend**\n",
+    "56. **wheelchair**\n",
+    "57. **windmill**\n",
+    "58. **workshop**\n",
+    "\"\"\"\n",
+    "\n",
+    "lines = list.split(\"\\n\")\n",
+    "for l in lines:\n",
+    "    if l.strip() == \"\":\n",
+    "        continue\n",
+    "    # extract str between ** and **\n",
+    "    word = re.search(r'\\*\\*(.*)\\*\\*', l).group(1)\n",
+    "\n",
+    "    import asyncio\n",
+    "    import edge_tts\n",
+    "    import pygame\n",
+    "    for VOICE in ['en-US-GuyNeural', 'en-US-MichelleNeural']:\n",
+    "        # OUTPUT_FILE = f\"{w}-{VOICE.replace('EricNeural', 'Guy-Male').replace('JennyNeural', 'Jenny-Female').replace('RyanNeural', 'Ryan-Male').replace('SoniaNeural', 'Sonia-Female').lower()}.mp3\"\n",
+    "        OUTPUT_FILE = f\"{word}-{VOICE.replace('GuyNeural', 'Male').replace('MichelleNeural', 'Female').replace('en-', '').lower()}.mp3\"\n",
+    "        communicate = edge_tts.Communicate(word, VOICE)\n",
+    "        await communicate.save(OUTPUT_FILE) \n",
+    "    # print(f\"Audio files for {word} created!\") \n",
+    "\n",
+    "    entry_us = search_in_json_database(json_database, word, 'us')\n",
+    "    if entry_us == 'not exist':\n",
+    "        phonetics = entry_us\n",
+    "    else:\n",
+    "        phonetics = entry_us['pronunciation']    \n",
+    "    wrapped_p = f' <span class=\"pho alt\">{phonetics}</span> <span class=\"speak-word-inline\" data-audio-us-male=\"/audios/us/{word}-us-male.mp3\" data-audio-us-female=\"/audios/us/{word}-us-female.mp3\"></span>'\n",
+    "    l += wrapped_p\n",
+    "\n",
+    "    print(l)"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "base",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.12.4"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}
diff --git a/1000-hours/public/jupyter-notebooks/conduct-us-female.mp3 b/1000-hours/public/jupyter-notebooks/conduct-us-female.mp3
new file mode 100644
index 00000000..9def4369
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/conduct-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/conduct-us-male.mp3 b/1000-hours/public/jupyter-notebooks/conduct-us-male.mp3
new file mode 100644
index 00000000..6e00a1c5
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/conduct-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/consent-us-female.mp3 b/1000-hours/public/jupyter-notebooks/consent-us-female.mp3
new file mode 100644
index 00000000..ed35e37a
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/consent-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/consent-us-male.mp3 b/1000-hours/public/jupyter-notebooks/consent-us-male.mp3
new file mode 100644
index 00000000..94454838
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/consent-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/construct-us-female.mp3 b/1000-hours/public/jupyter-notebooks/construct-us-female.mp3
new file mode 100644
index 00000000..d89dd10a
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/construct-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/construct-us-male.mp3 b/1000-hours/public/jupyter-notebooks/construct-us-male.mp3
new file mode 100644
index 00000000..53839471
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/construct-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/depend-us-female.mp3 b/1000-hours/public/jupyter-notebooks/depend-us-female.mp3
new file mode 100644
index 00000000..1081456c
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/depend-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/depend-us-male.mp3 b/1000-hours/public/jupyter-notebooks/depend-us-male.mp3
new file mode 100644
index 00000000..53d7aa28
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/depend-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/describe-us-female.mp3 b/1000-hours/public/jupyter-notebooks/describe-us-female.mp3
new file mode 100644
index 00000000..38fd7671
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/describe-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/describe-us-male.mp3 b/1000-hours/public/jupyter-notebooks/describe-us-male.mp3
new file mode 100644
index 00000000..eb6fb1a9
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/describe-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/destruct-us-female.mp3 b/1000-hours/public/jupyter-notebooks/destruct-us-female.mp3
new file mode 100644
index 00000000..3eef7ae4
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/destruct-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/destruct-us-male.mp3 b/1000-hours/public/jupyter-notebooks/destruct-us-male.mp3
new file mode 100644
index 00000000..a09ce1dc
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/destruct-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/dictate-us-female.mp3 b/1000-hours/public/jupyter-notebooks/dictate-us-female.mp3
new file mode 100644
index 00000000..82784a8b
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/dictate-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/dictate-us-male.mp3 b/1000-hours/public/jupyter-notebooks/dictate-us-male.mp3
new file mode 100644
index 00000000..c6d9479d
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/dictate-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/dictionary-us-female.mp3 b/1000-hours/public/jupyter-notebooks/dictionary-us-female.mp3
new file mode 100644
index 00000000..bc584ef6
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/dictionary-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/dictionary-us-male.mp3 b/1000-hours/public/jupyter-notebooks/dictionary-us-male.mp3
new file mode 100644
index 00000000..44242aa9
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/dictionary-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/dissect-us-female.mp3 b/1000-hours/public/jupyter-notebooks/dissect-us-female.mp3
new file mode 100644
index 00000000..8eca4698
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/dissect-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/dissect-us-male.mp3 b/1000-hours/public/jupyter-notebooks/dissect-us-male.mp3
new file mode 100644
index 00000000..3bf8deb3
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/dissect-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/evacuate-us-female.mp3 b/1000-hours/public/jupyter-notebooks/evacuate-us-female.mp3
new file mode 100644
index 00000000..cd8ed28e
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/evacuate-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/evacuate-us-male.mp3 b/1000-hours/public/jupyter-notebooks/evacuate-us-male.mp3
new file mode 100644
index 00000000..c5a03abf
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/evacuate-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/export-us-female.mp3 b/1000-hours/public/jupyter-notebooks/export-us-female.mp3
new file mode 100644
index 00000000..f909301a
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/export-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/export-us-male.mp3 b/1000-hours/public/jupyter-notebooks/export-us-male.mp3
new file mode 100644
index 00000000..09cf4aa8
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/export-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/fraction-us-female.mp3 b/1000-hours/public/jupyter-notebooks/fraction-us-female.mp3
new file mode 100644
index 00000000..6e83b2ad
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/fraction-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/fraction-us-male.mp3 b/1000-hours/public/jupyter-notebooks/fraction-us-male.mp3
new file mode 100644
index 00000000..26d9d128
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/fraction-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/fracture-us-female.mp3 b/1000-hours/public/jupyter-notebooks/fracture-us-female.mp3
new file mode 100644
index 00000000..d105328e
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/fracture-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/fracture-us-male.mp3 b/1000-hours/public/jupyter-notebooks/fracture-us-male.mp3
new file mode 100644
index 00000000..ac2b5f30
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/fracture-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/import-us-female.mp3 b/1000-hours/public/jupyter-notebooks/import-us-female.mp3
new file mode 100644
index 00000000..eb58b46a
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/import-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/import-us-male.mp3 b/1000-hours/public/jupyter-notebooks/import-us-male.mp3
new file mode 100644
index 00000000..caef6c13
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/import-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/infraction-us-female.mp3 b/1000-hours/public/jupyter-notebooks/infraction-us-female.mp3
new file mode 100644
index 00000000..66ceab29
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/infraction-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/infraction-us-male.mp3 b/1000-hours/public/jupyter-notebooks/infraction-us-male.mp3
new file mode 100644
index 00000000..c0f51476
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/infraction-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/inject-us-female.mp3 b/1000-hours/public/jupyter-notebooks/inject-us-female.mp3
new file mode 100644
index 00000000..c6e9cbf7
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/inject-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/inject-us-male.mp3 b/1000-hours/public/jupyter-notebooks/inject-us-male.mp3
new file mode 100644
index 00000000..fe8cfec7
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/inject-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/inspect-us-female.mp3 b/1000-hours/public/jupyter-notebooks/inspect-us-female.mp3
new file mode 100644
index 00000000..2faf411d
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/inspect-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/inspect-us-male.mp3 b/1000-hours/public/jupyter-notebooks/inspect-us-male.mp3
new file mode 100644
index 00000000..0079fa1e
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/inspect-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/intersect-us-female.mp3 b/1000-hours/public/jupyter-notebooks/intersect-us-female.mp3
new file mode 100644
index 00000000..cfc4092c
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/intersect-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/intersect-us-male.mp3 b/1000-hours/public/jupyter-notebooks/intersect-us-male.mp3
new file mode 100644
index 00000000..791b599a
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/intersect-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/invisible-us-female.mp3 b/1000-hours/public/jupyter-notebooks/invisible-us-female.mp3
new file mode 100644
index 00000000..de14b6e2
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/invisible-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/invisible-us-male.mp3 b/1000-hours/public/jupyter-notebooks/invisible-us-male.mp3
new file mode 100644
index 00000000..c21d2a82
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/invisible-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/judgment-us-female.mp3 b/1000-hours/public/jupyter-notebooks/judgment-us-female.mp3
new file mode 100644
index 00000000..9fafac6e
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/judgment-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/judgment-us-male.mp3 b/1000-hours/public/jupyter-notebooks/judgment-us-male.mp3
new file mode 100644
index 00000000..279aaa9b
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/judgment-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/judicial-us-female.mp3 b/1000-hours/public/jupyter-notebooks/judicial-us-female.mp3
new file mode 100644
index 00000000..be84803a
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/judicial-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/judicial-us-male.mp3 b/1000-hours/public/jupyter-notebooks/judicial-us-male.mp3
new file mode 100644
index 00000000..416ffa25
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/judicial-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/malfunction-us-female.mp3 b/1000-hours/public/jupyter-notebooks/malfunction-us-female.mp3
new file mode 100644
index 00000000..aab8228f
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/malfunction-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/malfunction-us-male.mp3 b/1000-hours/public/jupyter-notebooks/malfunction-us-male.mp3
new file mode 100644
index 00000000..6b1968dd
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/malfunction-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/malicious-us-female.mp3 b/1000-hours/public/jupyter-notebooks/malicious-us-female.mp3
new file mode 100644
index 00000000..ea067292
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/malicious-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/malicious-us-male.mp3 b/1000-hours/public/jupyter-notebooks/malicious-us-male.mp3
new file mode 100644
index 00000000..345c7c8a
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/malicious-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/malnutrition-us-female.mp3 b/1000-hours/public/jupyter-notebooks/malnutrition-us-female.mp3
new file mode 100644
index 00000000..01e9426e
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/malnutrition-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/malnutrition-us-male.mp3 b/1000-hours/public/jupyter-notebooks/malnutrition-us-male.mp3
new file mode 100644
index 00000000..9d11d07e
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/malnutrition-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/manuscript-us-female.mp3 b/1000-hours/public/jupyter-notebooks/manuscript-us-female.mp3
new file mode 100644
index 00000000..28ae1cef
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/manuscript-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/manuscript-us-male.mp3 b/1000-hours/public/jupyter-notebooks/manuscript-us-male.mp3
new file mode 100644
index 00000000..2a89f0f3
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/manuscript-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/maternal-us-female.mp3 b/1000-hours/public/jupyter-notebooks/maternal-us-female.mp3
new file mode 100644
index 00000000..0509a288
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/maternal-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/maternal-us-male.mp3 b/1000-hours/public/jupyter-notebooks/maternal-us-male.mp3
new file mode 100644
index 00000000..1c998f6d
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/maternal-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/maternity-us-female.mp3 b/1000-hours/public/jupyter-notebooks/maternity-us-female.mp3
new file mode 100644
index 00000000..cf19f1a7
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/maternity-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/maternity-us-male.mp3 b/1000-hours/public/jupyter-notebooks/maternity-us-male.mp3
new file mode 100644
index 00000000..4f50067e
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/maternity-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/matriarch-us-female.mp3 b/1000-hours/public/jupyter-notebooks/matriarch-us-female.mp3
new file mode 100644
index 00000000..bb1b2cf5
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/matriarch-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/matriarch-us-male.mp3 b/1000-hours/public/jupyter-notebooks/matriarch-us-male.mp3
new file mode 100644
index 00000000..01cda3f0
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/matriarch-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/mortal-us-female.mp3 b/1000-hours/public/jupyter-notebooks/mortal-us-female.mp3
new file mode 100644
index 00000000..0ebd9b12
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/mortal-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/mortal-us-male.mp3 b/1000-hours/public/jupyter-notebooks/mortal-us-male.mp3
new file mode 100644
index 00000000..d97cc58e
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/mortal-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/mortician-us-female.mp3 b/1000-hours/public/jupyter-notebooks/mortician-us-female.mp3
new file mode 100644
index 00000000..c71fe203
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/mortician-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/mortician-us-male.mp3 b/1000-hours/public/jupyter-notebooks/mortician-us-male.mp3
new file mode 100644
index 00000000..6362b12b
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/mortician-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/mortify-us-female.mp3 b/1000-hours/public/jupyter-notebooks/mortify-us-female.mp3
new file mode 100644
index 00000000..82913b33
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/mortify-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/mortify-us-male.mp3 b/1000-hours/public/jupyter-notebooks/mortify-us-male.mp3
new file mode 100644
index 00000000..5afd7fa1
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/mortify-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/multinational-us-female.mp3 b/1000-hours/public/jupyter-notebooks/multinational-us-female.mp3
new file mode 100644
index 00000000..edfc374c
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/multinational-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/multinational-us-male.mp3 b/1000-hours/public/jupyter-notebooks/multinational-us-male.mp3
new file mode 100644
index 00000000..68d2d3f8
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/multinational-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/multiple-us-female.mp3 b/1000-hours/public/jupyter-notebooks/multiple-us-female.mp3
new file mode 100644
index 00000000..bffca8c0
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/multiple-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/multiple-us-male.mp3 b/1000-hours/public/jupyter-notebooks/multiple-us-male.mp3
new file mode 100644
index 00000000..49070323
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/multiple-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/multiply-us-female.mp3 b/1000-hours/public/jupyter-notebooks/multiply-us-female.mp3
new file mode 100644
index 00000000..3ae7f883
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/multiply-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/multiply-us-male.mp3 b/1000-hours/public/jupyter-notebooks/multiply-us-male.mp3
new file mode 100644
index 00000000..6f981320
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/multiply-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/pendant-us-female.mp3 b/1000-hours/public/jupyter-notebooks/pendant-us-female.mp3
new file mode 100644
index 00000000..afd398c7
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/pendant-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/pendant-us-male.mp3 b/1000-hours/public/jupyter-notebooks/pendant-us-male.mp3
new file mode 100644
index 00000000..c8d84e0a
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/pendant-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/percent-us-female.mp3 b/1000-hours/public/jupyter-notebooks/percent-us-female.mp3
new file mode 100644
index 00000000..e32c0cf0
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/percent-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/percent-us-male.mp3 b/1000-hours/public/jupyter-notebooks/percent-us-male.mp3
new file mode 100644
index 00000000..8a91c057
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/percent-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/predict-us-female.mp3 b/1000-hours/public/jupyter-notebooks/predict-us-female.mp3
new file mode 100644
index 00000000..1eb13b41
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/predict-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/predict-us-male.mp3 b/1000-hours/public/jupyter-notebooks/predict-us-male.mp3
new file mode 100644
index 00000000..4c27d0ae
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/predict-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/prejudice-us-female.mp3 b/1000-hours/public/jupyter-notebooks/prejudice-us-female.mp3
new file mode 100644
index 00000000..c75d76e4
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/prejudice-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/prejudice-us-male.mp3 b/1000-hours/public/jupyter-notebooks/prejudice-us-male.mp3
new file mode 100644
index 00000000..2c398b9a
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/prejudice-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/produce-us-female.mp3 b/1000-hours/public/jupyter-notebooks/produce-us-female.mp3
new file mode 100644
index 00000000..f8471ffc
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/produce-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/produce-us-male.mp3 b/1000-hours/public/jupyter-notebooks/produce-us-male.mp3
new file mode 100644
index 00000000..48048d5a
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/produce-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/project-us-female.mp3 b/1000-hours/public/jupyter-notebooks/project-us-female.mp3
new file mode 100644
index 00000000..771e06e4
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/project-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/project-us-male.mp3 b/1000-hours/public/jupyter-notebooks/project-us-male.mp3
new file mode 100644
index 00000000..588998ed
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/project-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/reasonable-us-female.mp3 b/1000-hours/public/jupyter-notebooks/reasonable-us-female.mp3
deleted file mode 100644
index 9848215f..00000000
Binary files a/1000-hours/public/jupyter-notebooks/reasonable-us-female.mp3 and /dev/null differ
diff --git a/1000-hours/public/jupyter-notebooks/reasonable-us-male.mp3 b/1000-hours/public/jupyter-notebooks/reasonable-us-male.mp3
deleted file mode 100644
index 578ecb13..00000000
Binary files a/1000-hours/public/jupyter-notebooks/reasonable-us-male.mp3 and /dev/null differ
diff --git a/1000-hours/public/jupyter-notebooks/reduce-us-female.mp3 b/1000-hours/public/jupyter-notebooks/reduce-us-female.mp3
new file mode 100644
index 00000000..9785cfca
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/reduce-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/reduce-us-male.mp3 b/1000-hours/public/jupyter-notebooks/reduce-us-male.mp3
new file mode 100644
index 00000000..81064724
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/reduce-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/reject-us-female.mp3 b/1000-hours/public/jupyter-notebooks/reject-us-female.mp3
new file mode 100644
index 00000000..e6fc8eb3
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/reject-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/reject-us-male.mp3 b/1000-hours/public/jupyter-notebooks/reject-us-male.mp3
new file mode 100644
index 00000000..20e2183f
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/reject-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/section-us-female.mp3 b/1000-hours/public/jupyter-notebooks/section-us-female.mp3
new file mode 100644
index 00000000..f4af3ad6
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/section-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/section-us-male.mp3 b/1000-hours/public/jupyter-notebooks/section-us-male.mp3
new file mode 100644
index 00000000..906c63da
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/section-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/sensation-us-female.mp3 b/1000-hours/public/jupyter-notebooks/sensation-us-female.mp3
new file mode 100644
index 00000000..e3665679
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/sensation-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/sensation-us-male.mp3 b/1000-hours/public/jupyter-notebooks/sensation-us-male.mp3
new file mode 100644
index 00000000..162cf955
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/sensation-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/sensitive-us-female.mp3 b/1000-hours/public/jupyter-notebooks/sensitive-us-female.mp3
new file mode 100644
index 00000000..50112d8b
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/sensitive-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/sensitive-us-male.mp3 b/1000-hours/public/jupyter-notebooks/sensitive-us-male.mp3
new file mode 100644
index 00000000..e01480ee
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/sensitive-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/spectacle-us-female.mp3 b/1000-hours/public/jupyter-notebooks/spectacle-us-female.mp3
new file mode 100644
index 00000000..01d47b43
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/spectacle-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/spectacle-us-male.mp3 b/1000-hours/public/jupyter-notebooks/spectacle-us-male.mp3
new file mode 100644
index 00000000..b2964a0a
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/spectacle-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/spectator-us-female.mp3 b/1000-hours/public/jupyter-notebooks/spectator-us-female.mp3
new file mode 100644
index 00000000..3fbb9212
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/spectator-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/spectator-us-male.mp3 b/1000-hours/public/jupyter-notebooks/spectator-us-male.mp3
new file mode 100644
index 00000000..13508672
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/spectator-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/structure-us-female.mp3 b/1000-hours/public/jupyter-notebooks/structure-us-female.mp3
new file mode 100644
index 00000000..bd9d08ed
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/structure-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/structure-us-male.mp3 b/1000-hours/public/jupyter-notebooks/structure-us-male.mp3
new file mode 100644
index 00000000..f9752225
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/structure-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/submit-us-female.mp3 b/1000-hours/public/jupyter-notebooks/submit-us-female.mp3
new file mode 100644
index 00000000..da3f9f38
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/submit-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/submit-us-male.mp3 b/1000-hours/public/jupyter-notebooks/submit-us-male.mp3
new file mode 100644
index 00000000..975f26dd
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/submit-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/subscription-us-female.mp3 b/1000-hours/public/jupyter-notebooks/subscription-us-female.mp3
new file mode 100644
index 00000000..f8f9d6e1
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/subscription-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/subscription-us-male.mp3 b/1000-hours/public/jupyter-notebooks/subscription-us-male.mp3
new file mode 100644
index 00000000..81f1fbb8
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/subscription-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/suspend-us-female.mp3 b/1000-hours/public/jupyter-notebooks/suspend-us-female.mp3
new file mode 100644
index 00000000..2c8de0e5
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/suspend-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/suspend-us-male.mp3 b/1000-hours/public/jupyter-notebooks/suspend-us-male.mp3
new file mode 100644
index 00000000..06586e35
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/suspend-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/telegraph-us-female.mp3 b/1000-hours/public/jupyter-notebooks/telegraph-us-female.mp3
new file mode 100644
index 00000000..c963934d
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/telegraph-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/telegraph-us-male.mp3 b/1000-hours/public/jupyter-notebooks/telegraph-us-male.mp3
new file mode 100644
index 00000000..54927482
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/telegraph-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/telephone-us-female.mp3 b/1000-hours/public/jupyter-notebooks/telephone-us-female.mp3
new file mode 100644
index 00000000..3987f82a
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/telephone-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/telephone-us-male.mp3 b/1000-hours/public/jupyter-notebooks/telephone-us-male.mp3
new file mode 100644
index 00000000..e08e13e2
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/telephone-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/television-us-female.mp3 b/1000-hours/public/jupyter-notebooks/television-us-female.mp3
new file mode 100644
index 00000000..46e92c6c
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/television-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/television-us-male.mp3 b/1000-hours/public/jupyter-notebooks/television-us-male.mp3
new file mode 100644
index 00000000..7fd69a11
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/television-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/terrain-us-female.mp3 b/1000-hours/public/jupyter-notebooks/terrain-us-female.mp3
new file mode 100644
index 00000000..dc166b43
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/terrain-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/terrain-us-male.mp3 b/1000-hours/public/jupyter-notebooks/terrain-us-male.mp3
new file mode 100644
index 00000000..0278fa0d
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/terrain-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/terrestrial-us-female.mp3 b/1000-hours/public/jupyter-notebooks/terrestrial-us-female.mp3
new file mode 100644
index 00000000..5ab57963
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/terrestrial-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/terrestrial-us-male.mp3 b/1000-hours/public/jupyter-notebooks/terrestrial-us-male.mp3
new file mode 100644
index 00000000..cb402660
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/terrestrial-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/territory-us-female.mp3 b/1000-hours/public/jupyter-notebooks/territory-us-female.mp3
new file mode 100644
index 00000000..6e9ae1d9
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/territory-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/territory-us-male.mp3 b/1000-hours/public/jupyter-notebooks/territory-us-male.mp3
new file mode 100644
index 00000000..eafd752e
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/territory-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/transmit-us-female.mp3 b/1000-hours/public/jupyter-notebooks/transmit-us-female.mp3
new file mode 100644
index 00000000..ccf2b326
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/transmit-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/transmit-us-male.mp3 b/1000-hours/public/jupyter-notebooks/transmit-us-male.mp3
new file mode 100644
index 00000000..8658dce4
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/transmit-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/transport-us-female.mp3 b/1000-hours/public/jupyter-notebooks/transport-us-female.mp3
new file mode 100644
index 00000000..37461aad
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/transport-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/transport-us-male.mp3 b/1000-hours/public/jupyter-notebooks/transport-us-male.mp3
new file mode 100644
index 00000000..3e2b22e8
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/transport-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/vacant-us-female.mp3 b/1000-hours/public/jupyter-notebooks/vacant-us-female.mp3
new file mode 100644
index 00000000..3568e704
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/vacant-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/vacant-us-male.mp3 b/1000-hours/public/jupyter-notebooks/vacant-us-male.mp3
new file mode 100644
index 00000000..0d16667b
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/vacant-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/vacuum-us-female.mp3 b/1000-hours/public/jupyter-notebooks/vacuum-us-female.mp3
new file mode 100644
index 00000000..97848fa4
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/vacuum-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/vacuum-us-male.mp3 b/1000-hours/public/jupyter-notebooks/vacuum-us-male.mp3
new file mode 100644
index 00000000..51c540e5
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/vacuum-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/video-us-female.mp3 b/1000-hours/public/jupyter-notebooks/video-us-female.mp3
new file mode 100644
index 00000000..cb18e56c
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/video-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/video-us-male.mp3 b/1000-hours/public/jupyter-notebooks/video-us-male.mp3
new file mode 100644
index 00000000..835e36e5
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/video-us-male.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/vision-us-female.mp3 b/1000-hours/public/jupyter-notebooks/vision-us-female.mp3
new file mode 100644
index 00000000..c393d50a
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/vision-us-female.mp3 differ
diff --git a/1000-hours/public/jupyter-notebooks/vision-us-male.mp3 b/1000-hours/public/jupyter-notebooks/vision-us-male.mp3
new file mode 100644
index 00000000..b8ddeea6
Binary files /dev/null and b/1000-hours/public/jupyter-notebooks/vision-us-male.mp3 differ
diff --git a/1000-hours/sounds-of-american-english/2.2.16-spellings.md b/1000-hours/sounds-of-american-english/2.2.16-spellings.md
deleted file mode 100644
index 63517e24..00000000
--- a/1000-hours/sounds-of-american-english/2.2.16-spellings.md
+++ /dev/null
@@ -1,43 +0,0 @@
-# 拼读（Spellings and Sounds）
-
-之前的章节里，都罗列了对应每个音素可能的拼写。有些拼写只对应一个读音，比如，**h** 就只对应着 <span class="pho">h</span>；但，有一些拼写可能对应着多个读音。以下是一个总结整理，需要经过反复对照而暗熟于心。
-
-In the previous chapters, we listed the possible spellings for each phoneme. Some spellings correspond to just one sound, like **h**, which only corresponds to <span class="pho">h</span>. However, some spellings can correspond to multiple sounds. Here's a summary that needs to be reviewed repeatedly until it becomes second nature.
-
-## 元音拼写（Spellings of Vowels）
-
-* "**a**": `ɑː`, `æ`, `e`, `eɪ`, `ə`
-* "**ai**": `e`, `eɪ`
-* "**al**": `ɑː`, `æ`, `ɔː`
-* "**ar**": `ɑːr`, `ɚ`
-* "**au**": `ɑː`, `aʊ`, `ɔː`
-* "**e**": `e`, `ə`, `ɪ`, `iː`
-* "**ea**": `e`, `iː`, `eɪ`
-* "**ear**": `er`, `ɪr`, `ɝː`
-* "**er**": `ɚ`, `ɝː`
-* "**ew**": `uː`, `oʊ`
-* "**i**": `ɪ`, `aɪ`, `ə`, `j`,
-* "**ie**": `iː`, `e`, `aɪ`
-* "**o**": `ʌ`, `ɑː`, `ə`, `ɔː`, `uː`, `oʊ`
-* "**oo**": `ʌ`, `ʊ`, `uː`
-* "**oor**": `ʊr`, `ɔːr`
-* "**or**": `ɚ`, `ɝː`, `ɔːr`
-* "**ou**": `ʌ`, `ʊ`, `ə`, `aʊ`
-* "**ough**": `ɑː`, `oʊ`
-* "**our**": `aʊr`, `ʊr`, `ɔːr`
-* "**ow**": `aʊ`, `oʊ`
-* "**u**": `ʌ`, `ʊ`, `uː`, `ə`
-* "**ure**": `ɚ`, `ʊr`
-
-## 辅音拼写（Spellings of Consonants）
-
-* "**c**": `s`, `k`
-* "**ch**": `ʃ`, `k`, `ʧ`
-* "**d**": `d`, `dʒ`
-* "**g**": `g`, `dʒ`, `ʒ`
-* "**j**": `j`, `dʒ`
-* "**s**": `s`, `z`, `ʃ`, `ʒ`
-* "**ss**": `s`, `ʃ`
-* "**th**": `ð`, `θ`, `t`
-* "**y**": `ɪ`, `aɪ`, `i`, `j`
-* "**z**": `z`, `ʒ`
diff --git a/1000-hours/sounds-of-american-english/4-whats-next.md b/1000-hours/sounds-of-american-english/4-whats-next.md
new file mode 100644
index 00000000..afb89cab
--- /dev/null
+++ b/1000-hours/sounds-of-american-english/4-whats-next.md
@@ -0,0 +1,87 @@
+# 4. 而后（What's next）
+
+语音是可以通过 3 ～ 6 个月的密集训练彻底搞定的 —— 至少可以获得极大的改善。下一步是什么？下一步是搞定语言的另一方面，除了语音之外的文字 —— 任何语言都一样，都是且只是语音和文字的组合。
+
+With 3 to 6 months of intensive practice, you can really nail pronunciation — at least, you can see huge improvements. So, what's next? The next step is to master the other side of the language: the written word. Every language boils down to a combination of speaking and writing.
+
+文字的最基本要素是词汇。英文的词汇基本上是 “拼音文字”。英文的拼写，若是借用中文概念的话，有两种，一种 “表音”，一种 “表意” —— 或者 “既表音又表意”。
+
+```mermaid
+flowchart LR
+spellings(拼写)-...-phonetic-parts(音节)-...-sound&meaning(发音)
+spellings<-----> sound&meaning
+spellings(拼写)-...-semantic-parts(构件)-...-sound&meaning(含义及发音)
+```
+
+The most basic element of writing is vocabulary. English words are fundamentally "phonetic script." If we borrow concepts from Chinese, English spelling falls into two categories: one is "phonetic," the other is "semantic" — or sometimes "both phonetic and semantic."
+
+```mermaid
+flowchart LR
+spellings(spellings)-..-phonetic-parts(phonetic parts)-..-meaning&sound(meaning & sound)
+spellings(spellings)<---->meaning&sound(meaning & sound)
+spellings(spellings)-..-*semantic*-parts(semantic parts)-..-meaning&sound(meaning & sound)
+```
+
+比如，*apple* <span class="pho alt">ˈæp.əl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/apple-us-male.mp3" data-audio-us-female="/audios/us/apple-us-female.mp3"></span> 就是一个表音构成的词汇，总计两个音节，*app* 对应着第一个音节 <span class="pho alt">ˈæp</span>，*le* 对应着第二个音节 <span class="pho alt">əl</span>。所以，记忆它的时候，不是一个字母一个字母地背，说，“a、p、p、l、e…… *apple!*”。而是：<span class="pho alt">æ</span> 对应着 *a*；*app*，<span class="pho alt">p</span> 的拼写是两个叠加的 *pp*，而后是 <span class="pho alt">le</span> 对应着 <span class="pho alt">əl</span> —— 这样的拼写很常见，比如，*double* <span class="pho alt">ˈdʌb.əl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/double-us-male.mp3" data-audio-us-female="/audios/us/double-us-female.mp3"></span>, *impossible* <span class="pho alt">ɪmˈpɑː.sə.bəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/impossible-us-male.mp3" data-audio-us-female="/audios/us/impossible-us-female.mp3"></span>……
+
+For example, *apple* <span class="pho alt">ˈæp.əl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/apple-us-male.mp3" data-audio-us-female="/audios/us/apple-us-female.mp3"></span> is *phonetic* and has two syllables. The first syllable is *app* <span class="pho alt">ˈæp</span>, and the second syllable is *le* <span class="pho alt">əl</span>. So, when you’re memorizing it, you don’t go letter by letter saying, "a, p, p, l, e... *apple!*". Instead, think of it like this: <span class="pho alt">æ</span> matches with *a*; *app* includes <span class="pho alt">p</span> spelled as double *pp*, and then <span class="pho alt">le</span> matches with <span class="pho alt">əl</span>. This spelling pattern is quite common, for example, in words like *double* <span class="pho alt">ˈdʌb.əl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/double-us-male.mp3" data-audio-us-female="/audios/us/double-us-female.mp3"></span> and *impossible* <span class="pho alt">ɪmˈpɑː.sə.bəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/impossible-us-male.mp3" data-audio-us-female="/audios/us/impossible-us-female.mp3"></span>.
+
+另外，常用词汇中其实有不少是 “组合词汇”（*compound words*），各个组成部分也都是 “表意” 的。比如 *classroom* <span class="pho alt">ˈklæs.ruːm</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/classroom-us-male.mp3" data-audio-us-female="/audios/us/classroom-us-female.mp3"></span>, *doorbell* <span class="pho alt">ˈdɔːr.bel</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/doorbell-us-male.mp3" data-audio-us-female="/audios/us/doorbell-us-female.mp3"></span>, *handwriting* <span class="pho alt">ˈhændˌraɪ.t̬ɪŋ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/handwriting-us-male.mp3" data-audio-us-female="/audios/us/handwriting-us-female.mp3"></span>, *sunshine* <span class="pho alt">ˈsʌn.ʃaɪn</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/sunshine-us-male.mp3" data-audio-us-female="/audios/us/sunshine-us-female.mp3"></span>, *upstairs* <span class="pho alt">ʌpˈsterz</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/upstairs-us-male.mp3" data-audio-us-female="/audios/us/upstairs-us-female.mp3"></span> 等等。
+
+Besides, there are quite a few common words that are actually compound words, with each part contributing to the overall meaning, that is, they are *semantic*. For example, *classroom* <span class="pho alt">ˈklæs.ruːm</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/classroom-us-male.mp3" data-audio-us-female="/audios/us/classroom-us-female.mp3"></span>, *doorbell* <span class="pho alt">ˈdɔːr.bel</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/doorbell-us-male.mp3" data-audio-us-female="/audios/us/doorbell-us-female.mp3"></span>, *handwriting* <span class="pho alt">ˈhændˌraɪ.t̬ɪŋ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/handwriting-us-male.mp3" data-audio-us-female="/audios/us/handwriting-us-female.mp3"></span>, *sunshine* <span class="pho alt">ˈsʌn.ʃaɪn</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/sunshine-us-male.mp3" data-audio-us-female="/audios/us/sunshine-us-female.mp3"></span>, *upstairs* <span class="pho alt">ʌpˈsterz</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/upstairs-us-male.mp3" data-audio-us-female="/audios/us/upstairs-us-female.mp3"></span>, and so on.
+
+词根词缀，尤其是那些来自于拉丁语的词根词缀，在词汇量没达到一定程度之前，实际用处并不大 —— 但，到了一定地步，比如，词汇量超过 5,000 的时候，在这样扎实的基础上，稍微研究一下词根词缀，对快速且大量地做大词汇量是很有帮助的。
+
+Roots and affixes, especially those from Latin, aren’t very useful until your vocabulary reaches a certain level. But once you get to around 5,000 words, having a solid foundation, delving into roots and affixes can really help you expand your vocabulary quickly and significantly.
+
+举个例子，*ichthyosaur* <span class="pho alt">ˈɪk.θi.ə.sɔːr</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/ichthyosaur-us-male.mp3" data-audio-us-female="/audios/us/ichthyosaur-us-female.mp3"></span>，这个一看就知道并非常用的词汇，其实很简单，先从表音构成去看，<span class="pho alt">ˈɪk.θi.ə.sɔːr</span> —— 剑桥词典把它划分成了 4 个音节…… 但感觉上，第二第三个音节可以合并，<span class="pho alt">ˈɪk.θiə.sɔːr</span>，*ich* ⭤ <span class="pho alt">ˈɪk</span>, *thyo* ⭤ <span class="pho alt">θiə</span>, *saur* ⭤ <span class="pho alt">sɔːr</span>…… 而从表意的角度去看呢？前半部 *ichthyo-* 的意思是 “与鱼有关的”…… 后半部 *-saur* 是什么意思呢？各种恐龙的 “龙” 都是 -saur 结尾，于是，这个词的意思是 “鱼龙”…… 换言之，这个单词的两个部分，都是拉丁词根词缀，也都是 “既表音又表意” 的，事实上很简单 —— 虽然拼写乍看起来很复杂。
+
+Take *ichthyosaur* for example: <span class="pho alt">ˈɪk.θi.ə.sɔːr</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/ichthyosaur-us-male.mp3" data-audio-us-female="/audios/us/ichthyosaur-us-female.mp3"></span>. At a glance, you can tell it's not a common word. But it's actually quite simple. Let’s break it down by its sounds. The Cambridge Dictionary splits it into four syllables: <span class="pho alt">ˈɪk.θi.ə.sɔːr</span>. However, the second and third syllables feel like they can be combined: <span class="pho alt">ˈɪk.θiə.sɔːr</span>. So, *ich* is <span class="pho alt">ˈɪk</span>, *thyo* is <span class="pho alt">θiə</span>, and *saur* is <span class="pho alt">sɔːr</span>. From a *semantic* perspective, the first part, *ichthyo-*, means "related to fish." The second part, *-saur*, means "lizard" or "reptile," like in many dinosaur names that end in *-saur*. So, the word *ichthyosaur* means "*fish lizard*" or "*fish reptile*." In other words, this word's parts, drawn from Latin roots and suffixes, make it both *phonetically* and *semantically* simple, even if its spelling looks complicated at first glance.
+
+记忆词汇的最朴素最有效方法，就是把它的拼写、读音和意义联系起来 —— 这原本是文字本来的结构和意义。
+
+```mermaid
+flowchart LR
+
+sounds(读音)<--->meanings(意义)
+meanings<--->spellings(拼写)
+sounds<--->spellings
+```
+
+The simplest and most effective way to remember vocabulary is to connect its spelling, pronunciation, and meaning. This is essentially the structure and purpose of words.
+
+```mermaid
+flowchart LR
+
+sounds(sounds)<--->meanings(meanings)
+meanings<--->spellings(spellings)
+sounds<--->spellings
+```
+
+所以，背单词的时候，要边说边写，即然说出来了就能听得到，即然写出来了就能看得到 —— 它应该是一个同时调动多个感官的活动。
+
+When you're building vocabulary, you should say and write the words at the same time. If you speak it, you hear it. If you write it, you see it. It should be an activity that engages multiple senses at once.
+
+除此之外，其他的任何所谓的 “方法”，都不仅无效，甚至只有副作用，弊大于利。比如什么 “谐音记忆法” 或者 “趣味记忆法” 什么的，它们都违背大脑对语言文字的基本工作机制，根本不可能提高效率，只会增加不必要的负担 —— 虽然有时候觉竟然觉得有点意思……
+
+Apart from this approach, any other so-called "method" is not only ineffective but also counterproductive. Techniques like "homonym mnemonics" or "fun memory tricks" go against how the brain naturally processes language, speaking or writing. They don't improve efficiency; they just add unnecessary work, even if they sometimes seem somewhat amusing.
+
+人们失败的原因很简单，他们总想 “更省事儿一点”。坐在那里只用眼睛看，既不动口也不动手，也因此实际上更少动脑。只调用一个器官和同时调用多个器官是不一样的，前者好像更省事儿，可实际上由于脑力调用太少，导致的结果是 “效果几近于零”。
+
+The reason people fail is simple: they want to take the easy way out. They just sit there looking at words with their eyes, without speaking or writing, which means they engage their brains less. Using just one sense is not the same as using multiple senses simultaneously. The former might seem easier, but due to minimal brain engagement, the results are almost negligible.
+
+学外语的人十有八九失败。很多失败的人都曾经去问过老师，“老师，我背单词不记发音行不行？” “老师，我背单词不记拼写行不行？” 这种荒谬至极的问题问出来，并不是想要什么答案，只是想要一个 “偷懒认证”，给自己的偷懒找个背书…… 还别说，还真有老师说 “可以！” 因为真的有相当数量相当比例的老师，通过这种方法获得更多来自学生的好感，进而提高自己的收入……
+
+Most people fail at learning a new language. Many of them have asked their teachers, "Can I memorize words without learning their pronunciation?" or "Can I memorize words without learning how to spell them?" These absurd questions aren't looking for real answers; they are just seeking a justification to cut corners. And believe it or not, some teachers say "yes" to gain popularity and, as a result, increase their income.
+
+扩充词汇，是有 “加速度” 的过程 —— 可以越来越快…… 可是，在最初的时候，速度很低，加速度为零，所以总是感觉超级吃力。然而，词汇之间是有关联的，对大脑来说，一个生词与已有的词汇关联越多，越容易记住。也就是说，已有词汇量越多，新词可能与它们产生的关联越多，所以才越来越容易。当你的词汇量超过三五千的时候，你就会感觉很多生词几乎看一眼就记得住，无论是拼写还是读音还是其意义甚至其用法。
+
+Building your vocabulary has a snowball effect—you can pick up speed as you go. However, at the beginning, the speed is very low, and it feels incredibly hard. Words are interconnected. For your brain, the more links a new word has with the words you already know, the easier it is to remember. So, the larger your vocabulary, the more connections there are, and it becomes increasingly easier to learn new words. When your vocabulary exceeds three to five thousand words, you'll find that you can almost remember new words at a glance, including their spelling, pronunciation, meaning, and even usage.
+
+所以有个窍门。**直接背例句**…… 对大脑来说，“多朗读几遍例句” 远比 “只把力气花在某一个单词或者词组上” 来得更为轻松。在语言方面就是这样，你做得越多，对大脑来说越轻松，反过来，你做得越少，所谓 “省事儿” 逐步形成的，对大脑来说只能是不可逾越的障碍。
+
+Here's a tip: *memorize **sentences** directly*. For your brain, reading a few example sentences repeatedly is much easier than focusing all your effort on a single word or phrase. In language learning, the more you do, the easier it gets for your brain. Conversely, the less you do, the so-called "easier way" forms an insurmountable obstacle.
+
+进而，最靠谱的扩大词汇量方法：**精读**。找到自己真正感兴趣的书（小说类、非小说类各几本），遇到生词就查，逐一消灭 —— 每本书都要读若干遍（所以一定要选自己真迷恋的书）…… 读着读着，词汇量就大了，句法障碍就消失了，理解能力就提高了，阅读速度就飞快了…… 各种语言都是这样的。哪怕是我们的母语，我们对母语的掌控能力，也是这么练出来的 —— 学校里的语文课和语文老师，从来都帮不上什么忙…… 说点刻薄的话，这些语文老师啊，他们的唯一作用就是在考试里给绝大多数学生设置奇怪的障碍。
+
+The most reliable method to expand your vocabulary is *intensive reading*. Find books you are genuinely interested in (both fiction and non-fiction). Look up unfamiliar words and eliminate them one by one. Read each book several times, so make sure you really love these books. As you read, your vocabulary will grow, syntax barriers will disappear, your comprehension will improve, and your reading speed will soar. This applies to all languages. Even in our native language, our proficiency comes from practice—not from schools or language teachers. In fact, these teachers often only serve to create odd obstacles in exams.
diff --git a/1000-hours/sounds-of-american-english/4.1-multisounds.md b/1000-hours/sounds-of-american-english/4.1-multisounds.md
new file mode 100644
index 00000000..ae927fe2
--- /dev/null
+++ b/1000-hours/sounds-of-american-english/4.1-multisounds.md
@@ -0,0 +1,43 @@
+# 4.1. 多音拼写（Spellings with multiple sounds）
+
+之前的章节里，都罗列了对应每个音素可能的拼写。有些拼写只对应一个读音，比如，**h** 就只对应着 <span class="pho">h</span>；但，有一些拼写可能对应着多个读音。以下是一个总结整理，需要经过反复对照而暗熟于心。
+
+In the previous chapters, we listed the possible spellings for each phoneme. Some spellings correspond to just one sound, like **h**, which only corresponds to <span class="pho">h</span>. However, some spellings can correspond to multiple sounds. Here's a summary that needs to be reviewed repeatedly until it becomes second nature.
+
+## 4.1.1. 元音拼写（Spellings of Vowels）
+
+- "**a**": `ɑː`, `æ`, `e`, `eɪ`, `ə`
+- "**ai**": `e`, `eɪ`
+- "**al**": `ɑː`, `æ`, `ɔː`
+- "**ar**": `ɑːr`, `ɚ`
+- "**au**": `ɑː`, `aʊ`, `ɔː`
+- "**e**": `e`, `ə`, `ɪ`, `iː`
+- "**ea**": `e`, `iː`, `eɪ`
+- "**ear**": `er`, `ɪr`, `ɝː`
+- "**er**": `ɚ`, `ɝː`
+- "**ew**": `uː`, `oʊ`
+- "**i**": `ɪ`, `aɪ`, `ə`, `j`,
+- "**ie**": `iː`, `e`, `aɪ`
+- "**o**": `ʌ`, `ɑː`, `ə`, `ɔː`, `uː`, `oʊ`
+- "**oo**": `ʌ`, `ʊ`, `uː`
+- "**oor**": `ʊr`, `ɔːr`
+- "**or**": `ɚ`, `ɝː`, `ɔːr`
+- "**ou**": `ʌ`, `ʊ`, `ə`, `aʊ`
+- "**ough**": `ɑː`, `oʊ`
+- "**our**": `aʊr`, `ʊr`, `ɔːr`
+- "**ow**": `aʊ`, `oʊ`
+- "**u**": `ʌ`, `ʊ`, `uː`, `ə`
+- "**ure**": `ɚ`, `ʊr`
+
+## 4.1.2. 辅音拼写（Spellings of Consonants）
+
+- "**c**": `s`, `k`
+- "**ch**": `ʃ`, `k`, `ʧ`
+- "**d**": `d`, `dʒ`
+- "**g**": `g`, `dʒ`, `ʒ`
+- "**j**": `j`, `dʒ`
+- "**s**": `s`, `z`, `ʃ`, `ʒ`
+- "**ss**": `s`, `ʃ`
+- "**th**": `ð`, `θ`, `t`
+- "**y**": `ɪ`, `aɪ`, `i`, `j`
+- "**z**": `z`, `ʒ`
\ No newline at end of file
diff --git a/1000-hours/sounds-of-american-english/4.2-compounds.md b/1000-hours/sounds-of-american-english/4.2-compounds.md
new file mode 100644
index 00000000..2b783497
--- /dev/null
+++ b/1000-hours/sounds-of-american-english/4.2-compounds.md
@@ -0,0 +1,60 @@
+## 4.2. 常见组合词汇（Compound words）
+
+1. airplane <span class="pho alt">ˈer.pleɪn</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/airplane-us-male.mp3" data-audio-us-female="/audios/us/airplane-us-female.mp3"></span>
+2. airport <span class="pho alt">ˈer.pɔːrt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/airport-us-male.mp3" data-audio-us-female="/audios/us/airport-us-female.mp3"></span>
+3. backyard <span class="pho alt">ˌbækˈjɑːrd</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/backyard-us-male.mp3" data-audio-us-female="/audios/us/backyard-us-female.mp3"></span>
+4. bedroom <span class="pho alt">ˈbed.ruːm</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/bedroom-us-male.mp3" data-audio-us-female="/audios/us/bedroom-us-female.mp3"></span>
+5. birthday <span class="pho alt">ˈbɝːθ.deɪ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/birthday-us-male.mp3" data-audio-us-female="/audios/us/birthday-us-female.mp3"></span>
+6. blackboard <span class="pho alt">ˈblæk.bɔːrd</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/blackboard-us-male.mp3" data-audio-us-female="/audios/us/blackboard-us-female.mp3"></span>
+7. bookstore <span class="pho alt">ˈbʊk.stɔːr</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/bookstore-us-male.mp3" data-audio-us-female="/audios/us/bookstore-us-female.mp3"></span>
+8. brainstorm <span class="pho alt">ˈbreɪn.stɔːrm</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/brainstorm-us-male.mp3" data-audio-us-female="/audios/us/brainstorm-us-female.mp3"></span>
+9. breakfast <span class="pho alt">ˈbrek.fəst</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/breakfast-us-male.mp3" data-audio-us-female="/audios/us/breakfast-us-female.mp3"></span>
+10. classroom <span class="pho alt">ˈklæs.ruːm</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/classroom-us-male.mp3" data-audio-us-female="/audios/us/classroom-us-female.mp3"></span>
+11. cupcake <span class="pho alt">ˈkʌp.keɪk</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/cupcake-us-male.mp3" data-audio-us-female="/audios/us/cupcake-us-female.mp3"></span>
+12. daydream <span class="pho alt">ˈdeɪ.driːm</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/daydream-us-male.mp3" data-audio-us-female="/audios/us/daydream-us-female.mp3"></span>
+13. dishwasher <span class="pho alt">ˈdɪʃˌwɑː.ʃɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/dishwasher-us-male.mp3" data-audio-us-female="/audios/us/dishwasher-us-female.mp3"></span>
+14. doorbell <span class="pho alt">ˈdɔːr.bel</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/doorbell-us-male.mp3" data-audio-us-female="/audios/us/doorbell-us-female.mp3"></span>
+15. downtown <span class="pho alt">ˌdaʊnˈtaʊn</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/downtown-us-male.mp3" data-audio-us-female="/audios/us/downtown-us-female.mp3"></span>
+16. earthquake <span class="pho alt">ˈɝːθ.kweɪk</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/earthquake-us-male.mp3" data-audio-us-female="/audios/us/earthquake-us-female.mp3"></span>
+17. everyday <span class="pho alt">ˈev.ri.deɪ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/everyday-us-male.mp3" data-audio-us-female="/audios/us/everyday-us-female.mp3"></span>
+18. eyewitness <span class="pho alt">ˈaɪˌwɪt.nəs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/eyewitness-us-male.mp3" data-audio-us-female="/audios/us/eyewitness-us-female.mp3"></span>
+19. firefighter <span class="pho alt">ˈfaɪrˌfaɪ.t̬ɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/firefighter-us-male.mp3" data-audio-us-female="/audios/us/firefighter-us-female.mp3"></span>
+20. football <span class="pho alt">ˈfʊt.bɑːl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/football-us-male.mp3" data-audio-us-female="/audios/us/football-us-female.mp3"></span>
+21. greenhouse <span class="pho alt">ˈɡriːn.haʊs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/greenhouse-us-male.mp3" data-audio-us-female="/audios/us/greenhouse-us-female.mp3"></span>
+22. handwriting <span class="pho alt">ˈhændˌraɪ.t̬ɪŋ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/handwriting-us-male.mp3" data-audio-us-female="/audios/us/handwriting-us-female.mp3"></span>
+23. headache <span class="pho alt">ˈhed.eɪk</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/headache-us-male.mp3" data-audio-us-female="/audios/us/headache-us-female.mp3"></span>
+24. highway <span class="pho alt">ˈhaɪ.weɪ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/highway-us-male.mp3" data-audio-us-female="/audios/us/highway-us-female.mp3"></span>
+25. homework <span class="pho alt">ˈhoʊm.wɝːk</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/homework-us-male.mp3" data-audio-us-female="/audios/us/homework-us-female.mp3"></span>
+26. iceberg <span class="pho alt">ˈaɪs.bɝːɡ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/iceberg-us-male.mp3" data-audio-us-female="/audios/us/iceberg-us-female.mp3"></span>
+27. jellyfish <span class="pho alt">ˈdʒel.i.fɪʃ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/jellyfish-us-male.mp3" data-audio-us-female="/audios/us/jellyfish-us-female.mp3"></span>
+28. laptop <span class="pho alt">ˈlæp.tɑːp</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/laptop-us-male.mp3" data-audio-us-female="/audios/us/laptop-us-female.mp3"></span>
+29. lighthouse <span class="pho alt">ˈlaɪt.haʊs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/lighthouse-us-male.mp3" data-audio-us-female="/audios/us/lighthouse-us-female.mp3"></span>
+30. mailbox <span class="pho alt">ˈmeɪl.bɑːks</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/mailbox-us-male.mp3" data-audio-us-female="/audios/us/mailbox-us-female.mp3"></span>
+31. moonlight <span class="pho alt">ˈmuːn.laɪt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/moonlight-us-male.mp3" data-audio-us-female="/audios/us/moonlight-us-female.mp3"></span>
+32. notebook <span class="pho alt">ˈnoʊt.bʊk</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/notebook-us-male.mp3" data-audio-us-female="/audios/us/notebook-us-female.mp3"></span>
+33. nobody <span class="pho alt">ˈnoʊ.bɑː.di</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/nobody-us-male.mp3" data-audio-us-female="/audios/us/nobody-us-female.mp3"></span>
+34. pancake <span class="pho alt">ˈpæn.keɪk</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/pancake-us-male.mp3" data-audio-us-female="/audios/us/pancake-us-female.mp3"></span>
+35. postcard <span class="pho alt">ˈpoʊst.kɑːrd</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/postcard-us-male.mp3" data-audio-us-female="/audios/us/postcard-us-female.mp3"></span>
+36. rainbow <span class="pho alt">ˈreɪn.boʊ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/rainbow-us-male.mp3" data-audio-us-female="/audios/us/rainbow-us-female.mp3"></span>
+37. sailboat <span class="pho alt">ˈseɪl.boʊt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/sailboat-us-male.mp3" data-audio-us-female="/audios/us/sailboat-us-female.mp3"></span>
+38. sandbox <span class="pho alt">ˈsænd.bɑːks</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/sandbox-us-male.mp3" data-audio-us-female="/audios/us/sandbox-us-female.mp3"></span>
+39. seashore <span class="pho alt">ˈsiː.ʃɔːr</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/seashore-us-male.mp3" data-audio-us-female="/audios/us/seashore-us-female.mp3"></span>
+40. skateboard <span class="pho alt">ˈskeɪt.bɔːrd</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/skateboard-us-male.mp3" data-audio-us-female="/audios/us/skateboard-us-female.mp3"></span>
+41. snowflake <span class="pho alt">ˈsnoʊ.fleɪk</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/snowflake-us-male.mp3" data-audio-us-female="/audios/us/snowflake-us-female.mp3"></span>
+42. spaceship <span class="pho alt">ˈspeɪs.ʃɪp</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/spaceship-us-male.mp3" data-audio-us-female="/audios/us/spaceship-us-female.mp3"></span>
+43. sunflower <span class="pho alt">ˈsʌnˌflaʊ.ɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/sunflower-us-male.mp3" data-audio-us-female="/audios/us/sunflower-us-female.mp3"></span>
+44. sunshine <span class="pho alt">ˈsʌn.ʃaɪn</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/sunshine-us-male.mp3" data-audio-us-female="/audios/us/sunshine-us-female.mp3"></span>
+45. superhero <span class="pho alt">ˈsuː.pɚˌhɪr.oʊ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/superhero-us-male.mp3" data-audio-us-female="/audios/us/superhero-us-female.mp3"></span>
+46. tablecloth <span class="pho alt">ˈteɪ.bəl.klɑːθ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/tablecloth-us-male.mp3" data-audio-us-female="/audios/us/tablecloth-us-female.mp3"></span>
+47. toothbrush <span class="pho alt">ˈtuːθ.brʌʃ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/toothbrush-us-male.mp3" data-audio-us-female="/audios/us/toothbrush-us-female.mp3"></span>
+48. toothpaste <span class="pho alt">ˈtuːθ.peɪst</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/toothpaste-us-male.mp3" data-audio-us-female="/audios/us/toothpaste-us-female.mp3"></span>
+49. typewriter <span class="pho alt">ˈtaɪpˌraɪ.t̬ɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/typewriter-us-male.mp3" data-audio-us-female="/audios/us/typewriter-us-female.mp3"></span>
+50. underwater <span class="pho alt">ˌʌn.dɚˈwɑː.t̬ɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/underwater-us-male.mp3" data-audio-us-female="/audios/us/underwater-us-female.mp3"></span>
+51. upstairs <span class="pho alt">ʌpˈsterz</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/upstairs-us-male.mp3" data-audio-us-female="/audios/us/upstairs-us-female.mp3"></span>
+52. volleyball <span class="pho alt">ˈvɑː.li.bɑːl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/volleyball-us-male.mp3" data-audio-us-female="/audios/us/volleyball-us-female.mp3"></span>
+53. waterfall <span class="pho alt">ˈwɑː.t̬ɚ.fɑːl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/waterfall-us-male.mp3" data-audio-us-female="/audios/us/waterfall-us-female.mp3"></span>
+54. watermelon <span class="pho alt">ˈwɑː.t̬ɚˌmel.ən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/watermelon-us-male.mp3" data-audio-us-female="/audios/us/watermelon-us-female.mp3"></span>
+55. weekend <span class="pho alt">ˈwiːk.end</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/weekend-us-male.mp3" data-audio-us-female="/audios/us/weekend-us-female.mp3"></span>
+56. wheelchair <span class="pho alt">ˈwiːl.tʃer</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/wheelchair-us-male.mp3" data-audio-us-female="/audios/us/wheelchair-us-female.mp3"></span>
+57. windmill <span class="pho alt">ˈwɪnd.mɪl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/windmill-us-male.mp3" data-audio-us-female="/audios/us/windmill-us-female.mp3"></span>
+58. workshop <span class="pho alt">ˈwɝːk.ʃɑːp</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/workshop-us-male.mp3" data-audio-us-female="/audios/us/workshop-us-female.mp3"></span>
diff --git a/1000-hours/sounds-of-american-english/4.3-components.md b/1000-hours/sounds-of-american-english/4.3-components.md
new file mode 100644
index 00000000..5d6e665a
--- /dev/null
+++ b/1000-hours/sounds-of-american-english/4.3-components.md
@@ -0,0 +1,5 @@
+## 4.3 常见词根词缀（Common Roots and Affixes）
+
+英文的词根大多来自拉丁语；而常用词缀，包括前缀和后缀 —— 它们都是表意的。
+
+Most English word *roots* come from Latin, while commonly used *affixes*, including *prefixes* and *suffixes*, carry specific meanings, that is, *semantic*.
\ No newline at end of file
diff --git a/1000-hours/sounds-of-american-english/4.3.1-prefixes.md b/1000-hours/sounds-of-american-english/4.3.1-prefixes.md
new file mode 100644
index 00000000..e13086b7
--- /dev/null
+++ b/1000-hours/sounds-of-american-english/4.3.1-prefixes.md
@@ -0,0 +1,103 @@
+### 4.3.1. 常见前缀（Common Prefixes）
+
+
+1. **un-** (not, opposite of)
+   - unhappy <span class="pho alt">ʌnˈhæp.i</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/unhappy-us-male.mp3" data-audio-us-female="/audios/us/unhappy-us-female.mp3"></span>
+   - unknown <span class="pho alt">ʌnˈnoʊn</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/unknown-us-male.mp3" data-audio-us-female="/audios/us/unknown-us-female.mp3"></span>
+   - unusual <span class="pho alt">ʌnˈjuː.ʒu.əl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/unusual-us-male.mp3" data-audio-us-female="/audios/us/unusual-us-female.mp3"></span>
+
+2. **re-** (again, back)
+   - redo <span class="pho alt">riːˈduː</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/redo-us-male.mp3" data-audio-us-female="/audios/us/redo-us-female.mp3"></span>
+   - review <span class="pho alt">rɪˈvjuː</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/review-us-male.mp3" data-audio-us-female="/audios/us/review-us-female.mp3"></span>
+   - return <span class="pho alt">rɪˈtɝːn</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/return-us-male.mp3" data-audio-us-female="/audios/us/return-us-female.mp3"></span>
+
+3. **in-** (not, into)
+   - incomplete <span class="pho alt">ˌɪn.kəmˈpliːt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/incomplete-us-male.mp3" data-audio-us-female="/audios/us/incomplete-us-female.mp3"></span>
+   - invisible <span class="pho alt">ɪnˈvɪz.ə.bəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/invisible-us-male.mp3" data-audio-us-female="/audios/us/invisible-us-female.mp3"></span>
+   - inside <span class="pho alt">ɪnˈsaɪd</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/inside-us-male.mp3" data-audio-us-female="/audios/us/inside-us-female.mp3"></span>
+
+4. **dis-** (not, opposite of)
+   - disagree <span class="pho alt">ˌdɪs.əˈɡriː</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/disagree-us-male.mp3" data-audio-us-female="/audios/us/disagree-us-female.mp3"></span>
+   - disappear <span class="pho alt">ˌdɪs.əˈpɪr</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/disappear-us-male.mp3" data-audio-us-female="/audios/us/disappear-us-female.mp3"></span>
+   - disconnect <span class="pho alt">ˌdɪs.kəˈnekt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/disconnect-us-male.mp3" data-audio-us-female="/audios/us/disconnect-us-female.mp3"></span>
+
+5. **pre-** (before)
+   - preview <span class="pho alt">ˈpriː.vjuː</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/preview-us-male.mp3" data-audio-us-female="/audios/us/preview-us-female.mp3"></span>
+   - predict <span class="pho alt">prɪˈdɪkt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/predict-us-male.mp3" data-audio-us-female="/audios/us/predict-us-female.mp3"></span>
+   - preschool <span class="pho alt">ˈpriː.skuːl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/preschool-us-male.mp3" data-audio-us-female="/audios/us/preschool-us-female.mp3"></span>
+
+6. **mis-** (wrongly)
+   - misunderstand <span class="pho alt">ˌmɪs.ʌn.dɚˈstænd</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/misunderstand-us-male.mp3" data-audio-us-female="/audios/us/misunderstand-us-female.mp3"></span>
+   - misplace <span class="pho alt">ˌmɪsˈpleɪs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/misplace-us-male.mp3" data-audio-us-female="/audios/us/misplace-us-female.mp3"></span>
+   - mislead <span class="pho alt">ˌmɪsˈliːd</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/mislead-us-male.mp3" data-audio-us-female="/audios/us/mislead-us-female.mp3"></span>
+
+7. **non-** (not)
+   - nonstick <span class="pho alt">not exist</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/nonstick-us-male.mp3" data-audio-us-female="/audios/us/nonstick-us-female.mp3"></span>
+   - nonprofit <span class="pho alt">nɑnˈprɑf·ɪt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/nonprofit-us-male.mp3" data-audio-us-female="/audios/us/nonprofit-us-female.mp3"></span>
+   - nonviolent <span class="pho alt">ˌnɑːnˈvaɪə.lənt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/nonviolent-us-male.mp3" data-audio-us-female="/audios/us/nonviolent-us-female.mp3"></span>
+
+8. **over-** (too much)
+   - overeat <span class="pho alt">ˌoʊ.vɚˈiːt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/overeat-us-male.mp3" data-audio-us-female="/audios/us/overeat-us-female.mp3"></span>
+   - overwork <span class="pho alt">ˌoʊ.vɚˈwɝːk</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/overwork-us-male.mp3" data-audio-us-female="/audios/us/overwork-us-female.mp3"></span>
+   - overheat <span class="pho alt">ˌoʊ.vɚˈhiːt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/overheat-us-male.mp3" data-audio-us-female="/audios/us/overheat-us-female.mp3"></span>
+
+9. **sub-** (under)
+   - submarine <span class="pho alt">ˌsʌb.məˈriːn</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/submarine-us-male.mp3" data-audio-us-female="/audios/us/submarine-us-female.mp3"></span>
+   - subtitle <span class="pho alt">ˈsʌbˌtaɪ.t̬əl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/subtitle-us-male.mp3" data-audio-us-female="/audios/us/subtitle-us-female.mp3"></span>
+   - subconscious <span class="pho alt">ˌsʌbˈkɑːn.ʃəs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/subconscious-us-male.mp3" data-audio-us-female="/audios/us/subconscious-us-female.mp3"></span>
+
+10. **inter-** (between, among)
+    - international <span class="pho alt">ˌɪn.t̬ɚˈnæʃ.ən.əl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/international-us-male.mp3" data-audio-us-female="/audios/us/international-us-female.mp3"></span>
+    - interact <span class="pho alt">ˌɪn.t̬ɚˈækt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/interact-us-male.mp3" data-audio-us-female="/audios/us/interact-us-female.mp3"></span>
+    - interrupt <span class="pho alt">ˌɪn.t̬əˈrʌpt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/interrupt-us-male.mp3" data-audio-us-female="/audios/us/interrupt-us-female.mp3"></span>
+
+11. **trans-** (across, beyond)
+    - transport <span class="pho alt">ˈtræn.spɔːrt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/transport-us-male.mp3" data-audio-us-female="/audios/us/transport-us-female.mp3"></span>
+    - transfer <span class="pho alt">ˈtræns.fɝː</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/transfer-us-male.mp3" data-audio-us-female="/audios/us/transfer-us-female.mp3"></span>
+    - transform <span class="pho alt">trænsˈfɔːrm</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/transform-us-male.mp3" data-audio-us-female="/audios/us/transform-us-female.mp3"></span>
+
+12. **under-** (too little, below)
+    - underpaid <span class="pho alt">ˌʌn.dɚˈpeɪd</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/underpaid-us-male.mp3" data-audio-us-female="/audios/us/underpaid-us-female.mp3"></span>
+    - underestimate <span class="pho alt">ˌʌn.dɚˈes.tə.meɪt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/underestimate-us-male.mp3" data-audio-us-female="/audios/us/underestimate-us-female.mp3"></span>
+    - underground <span class="pho alt">ˌʌn.dɚˈɡraʊnd</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/underground-us-male.mp3" data-audio-us-female="/audios/us/underground-us-female.mp3"></span>
+
+13. **super-** (above, beyond)
+    - superhuman <span class="pho alt">ˌsuː.pɚˈhjuː.mən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/superhuman-us-male.mp3" data-audio-us-female="/audios/us/superhuman-us-female.mp3"></span>
+    - supermarket <span class="pho alt">ˈsuː.pɚˌmɑːr.kɪt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/supermarket-us-male.mp3" data-audio-us-female="/audios/us/supermarket-us-female.mp3"></span>
+    - supervisor <span class="pho alt">ˈsuː.pɚ.vaɪ.zɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/supervisor-us-male.mp3" data-audio-us-female="/audios/us/supervisor-us-female.mp3"></span>
+
+14. **semi-** (half, partly)
+    - semicircle <span class="pho alt">ˈsem.iˌsɝː.kəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/semicircle-us-male.mp3" data-audio-us-female="/audios/us/semicircle-us-female.mp3"></span>
+    - semifinal <span class="pho alt">ˌsem.iˈfaɪ.nəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/semifinal-us-male.mp3" data-audio-us-female="/audios/us/semifinal-us-female.mp3"></span>
+    - semiconscious <span class="pho alt">not exist</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/semiconscious-us-male.mp3" data-audio-us-female="/audios/us/semiconscious-us-female.mp3"></span>
+
+15. **anti-** (against)
+    - antibiotic <span class="pho alt">ˌæn.t̬i.baɪˈɑː.t̬ɪk</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/antibiotic-us-male.mp3" data-audio-us-female="/audios/us/antibiotic-us-female.mp3"></span>
+    - antifreeze <span class="pho alt">ˈæn.t̬i.friːz</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/antifreeze-us-male.mp3" data-audio-us-female="/audios/us/antifreeze-us-female.mp3"></span>
+    - antisocial <span class="pho alt">ˌæn.t̬iˈsoʊ.ʃəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/antisocial-us-male.mp3" data-audio-us-female="/audios/us/antisocial-us-female.mp3"></span>
+
+16. **de-** (down, away from)
+    - devalue <span class="pho alt">ˌdiːˈvæl.juː</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/devalue-us-male.mp3" data-audio-us-female="/audios/us/devalue-us-female.mp3"></span>
+    - defrost <span class="pho alt">ˌdiːˈfrɑːst</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/defrost-us-male.mp3" data-audio-us-female="/audios/us/defrost-us-female.mp3"></span>
+    - decode <span class="pho alt">diːˈkoʊd</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/decode-us-male.mp3" data-audio-us-female="/audios/us/decode-us-female.mp3"></span>
+
+17. **en-** (make, put into)
+    - enable <span class="pho alt">ɪˈneɪ.bəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/enable-us-male.mp3" data-audio-us-female="/audios/us/enable-us-female.mp3"></span>
+    - enrich <span class="pho alt">ɪnˈrɪtʃ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/enrich-us-male.mp3" data-audio-us-female="/audios/us/enrich-us-female.mp3"></span>
+    - encourage <span class="pho alt">ɪnˈkɝː.ɪdʒ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/encourage-us-male.mp3" data-audio-us-female="/audios/us/encourage-us-female.mp3"></span>
+
+18. **em-** (cause to)
+    - empower <span class="pho alt">-ˈpaʊr</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/empower-us-male.mp3" data-audio-us-female="/audios/us/empower-us-female.mp3"></span>
+    - embrace <span class="pho alt">ɪmˈbreɪs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/embrace-us-male.mp3" data-audio-us-female="/audios/us/embrace-us-female.mp3"></span>
+    - employ <span class="pho alt">ɪmˈplɔɪ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/employ-us-male.mp3" data-audio-us-female="/audios/us/employ-us-female.mp3"></span>
+
+19. **non-** (not)
+    - nonexistent <span class="pho alt">ˌnɑn·ɪɡˈzɪs·tənt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/nonexistent-us-male.mp3" data-audio-us-female="/audios/us/nonexistent-us-female.mp3"></span>
+    - nonsense <span class="pho alt">ˈnɑːn.sens</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/nonsense-us-male.mp3" data-audio-us-female="/audios/us/nonsense-us-female.mp3"></span>
+    - nonprofit <span class="pho alt">nɑnˈprɑf·ɪt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/nonprofit-us-male.mp3" data-audio-us-female="/audios/us/nonprofit-us-female.mp3"></span>
+
+20. **mid-** (middle)
+    - midnight <span class="pho alt">ˈmɪd.naɪt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/midnight-us-male.mp3" data-audio-us-female="/audios/us/midnight-us-female.mp3"></span>
+    - midterm <span class="pho alt">ˈmɪd.tɝːm</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/midterm-us-male.mp3" data-audio-us-female="/audios/us/midterm-us-female.mp3"></span>
+    - midfield <span class="pho alt">ˈmɪd.fiːld</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/midfield-us-male.mp3" data-audio-us-female="/audios/us/midfield-us-female.mp3"></span>
+
diff --git a/1000-hours/sounds-of-american-english/4.3.2-suffixes.md b/1000-hours/sounds-of-american-english/4.3.2-suffixes.md
new file mode 100644
index 00000000..8dfce8c3
--- /dev/null
+++ b/1000-hours/sounds-of-american-english/4.3.2-suffixes.md
@@ -0,0 +1,103 @@
+# 4.3.2. 常见后缀（Common Suffixes）
+
+
+1. **-able** (capable of)
+   - readable <span class="pho alt">ˈriː.də.bəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/readable-us-male.mp3" data-audio-us-female="/audios/us/readable-us-female.mp3"></span>
+   - manageable <span class="pho alt">ˈmæn.ə.dʒə.bəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/manageable-us-male.mp3" data-audio-us-female="/audios/us/manageable-us-female.mp3"></span>
+   - comfortable <span class="pho alt">ˈkʌm.fɚ.t̬ə.bəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/comfortable-us-male.mp3" data-audio-us-female="/audios/us/comfortable-us-female.mp3"></span>
+
+2. **-ible** (capable of)
+   - visible <span class="pho alt">ˈvɪz.ə.bəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/visible-us-male.mp3" data-audio-us-female="/audios/us/visible-us-female.mp3"></span>
+   - flexible <span class="pho alt">ˈflek.sə.bəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/flexible-us-male.mp3" data-audio-us-female="/audios/us/flexible-us-female.mp3"></span>
+   - edible <span class="pho alt">ˈed.ə.bəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/edible-us-male.mp3" data-audio-us-female="/audios/us/edible-us-female.mp3"></span>
+
+3. **-al** (relating to)
+   - natural <span class="pho alt">ˈnætʃ.ɚ.əl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/natural-us-male.mp3" data-audio-us-female="/audios/us/natural-us-female.mp3"></span>
+   - musical <span class="pho alt">ˈmjuː.zɪ.kəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/musical-us-male.mp3" data-audio-us-female="/audios/us/musical-us-female.mp3"></span>
+   - personal <span class="pho alt">ˈpɝː.sən.əl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/personal-us-male.mp3" data-audio-us-female="/audios/us/personal-us-female.mp3"></span>
+
+4. **-ful** (full of)
+   - helpful <span class="pho alt">ˈhelp.fəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/helpful-us-male.mp3" data-audio-us-female="/audios/us/helpful-us-female.mp3"></span>
+   - joyful <span class="pho alt">ˈdʒɔɪ.fəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/joyful-us-male.mp3" data-audio-us-female="/audios/us/joyful-us-female.mp3"></span>
+   - careful <span class="pho alt">ˈker.fəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/careful-us-male.mp3" data-audio-us-female="/audios/us/careful-us-female.mp3"></span>
+
+5. **-less** (without)
+   - hopeless <span class="pho alt">ˈhoʊp.ləs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/hopeless-us-male.mp3" data-audio-us-female="/audios/us/hopeless-us-female.mp3"></span>
+   - fearless <span class="pho alt">ˈfɪr.ləs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/fearless-us-male.mp3" data-audio-us-female="/audios/us/fearless-us-female.mp3"></span>
+   - endless <span class="pho alt">ˈend.ləs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/endless-us-male.mp3" data-audio-us-female="/audios/us/endless-us-female.mp3"></span>
+
+6. **-ly** (in the manner of)
+   - quickly <span class="pho alt">ˈkwɪk.li</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/quickly-us-male.mp3" data-audio-us-female="/audios/us/quickly-us-female.mp3"></span>
+   - slowly <span class="pho alt">ˈsloʊ.li</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/slowly-us-male.mp3" data-audio-us-female="/audios/us/slowly-us-female.mp3"></span>
+   - happily <span class="pho alt">ˈhæp.əl.i</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/happily-us-male.mp3" data-audio-us-female="/audios/us/happily-us-female.mp3"></span>
+
+7. **-ment** (action or process)
+   - development <span class="pho alt">dɪˈvel.əp.mənt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/development-us-male.mp3" data-audio-us-female="/audios/us/development-us-female.mp3"></span>
+   - agreement <span class="pho alt">əˈɡriː.mənt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/agreement-us-male.mp3" data-audio-us-female="/audios/us/agreement-us-female.mp3"></span>
+   - improvement <span class="pho alt">ɪmˈpruːv.mənt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/improvement-us-male.mp3" data-audio-us-female="/audios/us/improvement-us-female.mp3"></span>
+
+8. **-ness** (state or quality)
+   - kindness <span class="pho alt">ˈkaɪnd.nəs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/kindness-us-male.mp3" data-audio-us-female="/audios/us/kindness-us-female.mp3"></span>
+   - darkness <span class="pho alt">ˈdɑːrk.nəs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/darkness-us-male.mp3" data-audio-us-female="/audios/us/darkness-us-female.mp3"></span>
+   - happiness <span class="pho alt">ˈhæp.i.nəs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/happiness-us-male.mp3" data-audio-us-female="/audios/us/happiness-us-female.mp3"></span>
+
+9. **-er** (one who, comparative)
+   - teacher <span class="pho alt">ˈtiː.tʃɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/teacher-us-male.mp3" data-audio-us-female="/audios/us/teacher-us-female.mp3"></span>
+   - runner <span class="pho alt">ˈrʌn.ɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/runner-us-male.mp3" data-audio-us-female="/audios/us/runner-us-female.mp3"></span>
+   - faster <span class="pho alt">fæst</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/faster-us-male.mp3" data-audio-us-female="/audios/us/faster-us-female.mp3"></span>
+
+10. **-or** (one who)
+    - actor <span class="pho alt">ˈæk.tɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/actor-us-male.mp3" data-audio-us-female="/audios/us/actor-us-female.mp3"></span>
+    - inventor <span class="pho alt">ɪnˈven.t̬ɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/inventor-us-male.mp3" data-audio-us-female="/audios/us/inventor-us-female.mp3"></span>
+    - conductor <span class="pho alt">kənˈdʌk.tɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/conductor-us-male.mp3" data-audio-us-female="/audios/us/conductor-us-female.mp3"></span>
+
+11. **-ist** (one who practices)
+    - artist <span class="pho alt">ˈɑːr.t̬ɪst</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/artist-us-male.mp3" data-audio-us-female="/audios/us/artist-us-female.mp3"></span>
+    - scientist <span class="pho alt">ˈsaɪən.tɪst</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/scientist-us-male.mp3" data-audio-us-female="/audios/us/scientist-us-female.mp3"></span>
+    - pianist <span class="pho alt">ˈpiː.ən.ɪst</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/pianist-us-male.mp3" data-audio-us-female="/audios/us/pianist-us-female.mp3"></span>
+
+12. **-ion** (action or condition)
+    - celebration <span class="pho alt">ˌsel.əˈbreɪ.ʃən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/celebration-us-male.mp3" data-audio-us-female="/audios/us/celebration-us-female.mp3"></span>
+    - decision <span class="pho alt">dɪˈsɪʒ.ən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/decision-us-male.mp3" data-audio-us-female="/audios/us/decision-us-female.mp3"></span>
+    - creation <span class="pho alt">kriˈeɪ.ʃən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/creation-us-male.mp3" data-audio-us-female="/audios/us/creation-us-female.mp3"></span>
+
+13. **-tion** (action or condition)
+    - education <span class="pho alt">ˌedʒ.əˈkeɪ.ʃən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/education-us-male.mp3" data-audio-us-female="/audios/us/education-us-female.mp3"></span>
+    - suggestion <span class="pho alt">səˈdʒes.tʃən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/suggestion-us-male.mp3" data-audio-us-female="/audios/us/suggestion-us-female.mp3"></span>
+    - transportation <span class="pho alt">ˌtræn.spɚˈteɪ.ʃən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/transportation-us-male.mp3" data-audio-us-female="/audios/us/transportation-us-female.mp3"></span>
+
+14. **-sion** (state or condition)
+    - admission <span class="pho alt">ədˈmɪʃ.ən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/admission-us-male.mp3" data-audio-us-female="/audios/us/admission-us-female.mp3"></span>
+    - confusion <span class="pho alt">kənˈfjuː.ʒən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/confusion-us-male.mp3" data-audio-us-female="/audios/us/confusion-us-female.mp3"></span>
+    - extension <span class="pho alt">ɪkˈsten.ʃən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/extension-us-male.mp3" data-audio-us-female="/audios/us/extension-us-female.mp3"></span>
+
+15. **-ous** (full of)
+    - dangerous <span class="pho alt">ˈdeɪn.dʒɚ.əs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/dangerous-us-male.mp3" data-audio-us-female="/audios/us/dangerous-us-female.mp3"></span>
+    - nervous <span class="pho alt">ˈnɝː.vəs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/nervous-us-male.mp3" data-audio-us-female="/audios/us/nervous-us-female.mp3"></span>
+    - famous <span class="pho alt">ˈfeɪ.məs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/famous-us-male.mp3" data-audio-us-female="/audios/us/famous-us-female.mp3"></span>
+
+16. **-ive** (tending to)
+    - active <span class="pho alt">ˈæk.tɪv</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/active-us-male.mp3" data-audio-us-female="/audios/us/active-us-female.mp3"></span>
+    - creative <span class="pho alt">kriˈeɪ.t̬ɪv</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/creative-us-male.mp3" data-audio-us-female="/audios/us/creative-us-female.mp3"></span>
+    - attractive <span class="pho alt">əˈtræk.tɪv</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/attractive-us-male.mp3" data-audio-us-female="/audios/us/attractive-us-female.mp3"></span>
+
+17. **-ic** (relating to)
+    - artistic <span class="pho alt">ɑːrˈtɪs.tɪk</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/artistic-us-male.mp3" data-audio-us-female="/audios/us/artistic-us-female.mp3"></span>
+    - athletic <span class="pho alt">æθˈlet̬.ɪk</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/athletic-us-male.mp3" data-audio-us-female="/audios/us/athletic-us-female.mp3"></span>
+    - energetic <span class="pho alt">ˌen.ɚˈdʒet̬.ɪk</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/energetic-us-male.mp3" data-audio-us-female="/audios/us/energetic-us-female.mp3"></span>
+
+18. **-ity** (state or quality)
+    - reality <span class="pho alt">riˈæl.ə.t̬i</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/reality-us-male.mp3" data-audio-us-female="/audios/us/reality-us-female.mp3"></span>
+    - ability <span class="pho alt">əˈbɪl.ə.t̬i</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/ability-us-male.mp3" data-audio-us-female="/audios/us/ability-us-female.mp3"></span>
+    - simplicity <span class="pho alt">sɪmˈplɪs.ə.t̬i</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/simplicity-us-male.mp3" data-audio-us-female="/audios/us/simplicity-us-female.mp3"></span>
+
+19. **-ance** (state or quality)
+    - performance <span class="pho alt">pɚˈfɔːr.məns</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/performance-us-male.mp3" data-audio-us-female="/audios/us/performance-us-female.mp3"></span>
+    - importance <span class="pho alt">ɪmˈpɔːr.təns</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/importance-us-male.mp3" data-audio-us-female="/audios/us/importance-us-female.mp3"></span>
+    - acceptance <span class="pho alt">əkˈsep.təns</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/acceptance-us-male.mp3" data-audio-us-female="/audios/us/acceptance-us-female.mp3"></span>
+
+20. **-ence** (state or quality)
+    - difference <span class="pho alt">ˈdɪf.ɚ.əns</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/difference-us-male.mp3" data-audio-us-female="/audios/us/difference-us-female.mp3"></span>
+    - independence <span class="pho alt">ˌɪn.dɪˈpen.dəns</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/independence-us-male.mp3" data-audio-us-female="/audios/us/independence-us-female.mp3"></span>
+    - existence <span class="pho alt">ɪɡˈzɪs.təns</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/existence-us-male.mp3" data-audio-us-female="/audios/us/existence-us-female.mp3"></span>
+
diff --git a/1000-hours/sounds-of-american-english/4.3.3-roots.md b/1000-hours/sounds-of-american-english/4.3.3-roots.md
new file mode 100644
index 00000000..5fdd0d29
--- /dev/null
+++ b/1000-hours/sounds-of-american-english/4.3.3-roots.md
@@ -0,0 +1,128 @@
+# 4.3.3. 常见词根（Common Roots）
+
+
+1. **aqua** (water)
+   - aquarium <span class="pho alt">əˈkwer.i.əm</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/aquarium-us-male.mp3" data-audio-us-female="/audios/us/aquarium-us-female.mp3"></span>
+   - aquatic <span class="pho alt">əˈkwæt̬.ɪk</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/aquatic-us-male.mp3" data-audio-us-female="/audios/us/aquatic-us-female.mp3"></span>
+   - aqueduct <span class="pho alt">ˈæk.wə.dʌkt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/aqueduct-us-male.mp3" data-audio-us-female="/audios/us/aqueduct-us-female.mp3"></span>
+
+2. **aud** (hear)
+   - audience <span class="pho alt">ˈɑː.di.əns</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/audience-us-male.mp3" data-audio-us-female="/audios/us/audience-us-female.mp3"></span>
+   - audio <span class="pho alt">ˈɑː.di.oʊ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/audio-us-male.mp3" data-audio-us-female="/audios/us/audio-us-female.mp3"></span>
+   - audition <span class="pho alt">ɑːˈdɪʃ.ən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/audition-us-male.mp3" data-audio-us-female="/audios/us/audition-us-female.mp3"></span>
+
+3. **bene** (good, well)
+   - benefit <span class="pho alt">ˈben.ə.fɪt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/benefit-us-male.mp3" data-audio-us-female="/audios/us/benefit-us-female.mp3"></span>
+   - benevolent <span class="pho alt">bəˈnev.əl.ənt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/benevolent-us-male.mp3" data-audio-us-female="/audios/us/benevolent-us-female.mp3"></span>
+   - benefactor <span class="pho alt">ˈben.ə.fæk.tɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/benefactor-us-male.mp3" data-audio-us-female="/audios/us/benefactor-us-female.mp3"></span>
+
+4. **cent** (hundred)
+   - century <span class="pho alt">ˈsen.tʃər.i</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/century-us-male.mp3" data-audio-us-female="/audios/us/century-us-female.mp3"></span>
+   - percent <span class="pho alt">pɚˈsent</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/percent-us-male.mp3" data-audio-us-female="/audios/us/percent-us-female.mp3"></span>
+   - centennial <span class="pho alt">senˈten.i.əl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/centennial-us-male.mp3" data-audio-us-female="/audios/us/centennial-us-female.mp3"></span>
+
+5. **dict** (say, speak)
+   - dictionary <span class="pho alt">ˈdɪk.ʃən.er.i</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/dictionary-us-male.mp3" data-audio-us-female="/audios/us/dictionary-us-female.mp3"></span>
+   - predict <span class="pho alt">prɪˈdɪkt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/predict-us-male.mp3" data-audio-us-female="/audios/us/predict-us-female.mp3"></span>
+   - dictate <span class="pho alt">ˈdɪk.teɪt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/dictate-us-male.mp3" data-audio-us-female="/audios/us/dictate-us-female.mp3"></span>
+
+6. **duc** (lead)
+   - conduct <span class="pho alt">kənˈdʌkt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/conduct-us-male.mp3" data-audio-us-female="/audios/us/conduct-us-female.mp3"></span>
+   - produce <span class="pho alt">prəˈduːs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/produce-us-male.mp3" data-audio-us-female="/audios/us/produce-us-female.mp3"></span>
+   - reduce <span class="pho alt">rɪˈduːs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/reduce-us-male.mp3" data-audio-us-female="/audios/us/reduce-us-female.mp3"></span>
+
+7. **fract** (break)
+   - fracture <span class="pho alt">ˈfræk.tʃɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/fracture-us-male.mp3" data-audio-us-female="/audios/us/fracture-us-female.mp3"></span>
+   - fraction <span class="pho alt">ˈfræk.ʃən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/fraction-us-male.mp3" data-audio-us-female="/audios/us/fraction-us-female.mp3"></span>
+   - infraction <span class="pho alt">ɪnˈfræk.ʃən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/infraction-us-male.mp3" data-audio-us-female="/audios/us/infraction-us-female.mp3"></span>
+
+8. **ject** (throw)
+   - project <span class="pho alt">ˈprɑː.dʒekt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/project-us-male.mp3" data-audio-us-female="/audios/us/project-us-female.mp3"></span>
+   - inject <span class="pho alt">ɪnˈdʒekt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/inject-us-male.mp3" data-audio-us-female="/audios/us/inject-us-female.mp3"></span>
+   - reject <span class="pho alt">rɪˈdʒekt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/reject-us-male.mp3" data-audio-us-female="/audios/us/reject-us-female.mp3"></span>
+
+9. **jud** (judge)
+   - judicial <span class="pho alt">dʒuːˈdɪʃ.əl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/judicial-us-male.mp3" data-audio-us-female="/audios/us/judicial-us-female.mp3"></span>
+   - prejudice <span class="pho alt">ˈpredʒ.ə.dɪs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/prejudice-us-male.mp3" data-audio-us-female="/audios/us/prejudice-us-female.mp3"></span>
+   - judgment <span class="pho alt">ˈdʒʌdʒ.mənt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/judgment-us-male.mp3" data-audio-us-female="/audios/us/judgment-us-female.mp3"></span>
+
+10. **mal** (bad, ill)
+    - malnutrition <span class="pho alt">ˌmæl.nuːˈtrɪʃ.ən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/malnutrition-us-male.mp3" data-audio-us-female="/audios/us/malnutrition-us-female.mp3"></span>
+    - malicious <span class="pho alt">məˈlɪʃ.əs</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/malicious-us-male.mp3" data-audio-us-female="/audios/us/malicious-us-female.mp3"></span>
+    - malfunction <span class="pho alt">ˌmælˈfʌŋk.ʃən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/malfunction-us-male.mp3" data-audio-us-female="/audios/us/malfunction-us-female.mp3"></span>
+
+11. **mater** (mother)
+    - maternal <span class="pho alt">məˈtɝː.nəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/maternal-us-male.mp3" data-audio-us-female="/audios/us/maternal-us-female.mp3"></span>
+    - maternity <span class="pho alt">məˈtɝː.nə.t̬i</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/maternity-us-male.mp3" data-audio-us-female="/audios/us/maternity-us-female.mp3"></span>
+    - matriarch <span class="pho alt">ˈmeɪ.tri.ɑːrk</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/matriarch-us-male.mp3" data-audio-us-female="/audios/us/matriarch-us-female.mp3"></span>
+
+12. **mit** (send)
+    - transmit <span class="pho alt">trænsˈmɪt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/transmit-us-male.mp3" data-audio-us-female="/audios/us/transmit-us-female.mp3"></span>
+    - admit <span class="pho alt">ədˈmɪt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/admit-us-male.mp3" data-audio-us-female="/audios/us/admit-us-female.mp3"></span>
+    - submit <span class="pho alt">səbˈmɪt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/submit-us-male.mp3" data-audio-us-female="/audios/us/submit-us-female.mp3"></span>
+
+13. **mort** (death)
+    - mortal <span class="pho alt">ˈmɔːr.t̬əl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/mortal-us-male.mp3" data-audio-us-female="/audios/us/mortal-us-female.mp3"></span>
+    - mortician <span class="pho alt">mɔːrˈtɪʃ.ən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/mortician-us-male.mp3" data-audio-us-female="/audios/us/mortician-us-female.mp3"></span>
+    - mortify <span class="pho alt">ˈmɔːr.t̬ə.faɪ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/mortify-us-male.mp3" data-audio-us-female="/audios/us/mortify-us-female.mp3"></span>
+
+14. **multi** (many)
+    - multiple <span class="pho alt">ˈmʌl.tə.pəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/multiple-us-male.mp3" data-audio-us-female="/audios/us/multiple-us-female.mp3"></span>
+    - multiply <span class="pho alt">ˈmʌl.tə.plaɪ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/multiply-us-male.mp3" data-audio-us-female="/audios/us/multiply-us-female.mp3"></span>
+    - multinational <span class="pho alt">ˌmʌl.t̬iˈnæʃ.ən.əl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/multinational-us-male.mp3" data-audio-us-female="/audios/us/multinational-us-female.mp3"></span>
+
+15. **pend** (hang, weigh)
+    - pendant <span class="pho alt">ˈpen.dənt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/pendant-us-male.mp3" data-audio-us-female="/audios/us/pendant-us-female.mp3"></span>
+    - suspend <span class="pho alt">səˈspend</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/suspend-us-male.mp3" data-audio-us-female="/audios/us/suspend-us-female.mp3"></span>
+    - depend <span class="pho alt">dɪˈpend</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/depend-us-male.mp3" data-audio-us-female="/audios/us/depend-us-female.mp3"></span>
+
+16. **port** (carry)
+    - transport <span class="pho alt">ˈtræn.spɔːrt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/transport-us-male.mp3" data-audio-us-female="/audios/us/transport-us-female.mp3"></span>
+    - export <span class="pho alt">ˈek.spɔːrt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/export-us-male.mp3" data-audio-us-female="/audios/us/export-us-female.mp3"></span>
+    - import <span class="pho alt">ˈɪm.pɔːrt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/import-us-male.mp3" data-audio-us-female="/audios/us/import-us-female.mp3"></span>
+
+17. **scrib/script** (write)
+    - describe <span class="pho alt">dɪˈskraɪb</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/describe-us-male.mp3" data-audio-us-female="/audios/us/describe-us-female.mp3"></span>
+    - manuscript <span class="pho alt">ˈmæn.jə.skrɪpt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/manuscript-us-male.mp3" data-audio-us-female="/audios/us/manuscript-us-female.mp3"></span>
+    - subscription <span class="pho alt">səbˈskrɪp.ʃən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/subscription-us-male.mp3" data-audio-us-female="/audios/us/subscription-us-female.mp3"></span>
+
+18. **sect/sec** (cut)
+    - section <span class="pho alt">ˈsek.ʃən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/section-us-male.mp3" data-audio-us-female="/audios/us/section-us-female.mp3"></span>
+    - dissect <span class="pho alt">daɪˈsekt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/dissect-us-male.mp3" data-audio-us-female="/audios/us/dissect-us-female.mp3"></span>
+    - intersect <span class="pho alt">ˌɪn.t̬ɚˈsekt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/intersect-us-male.mp3" data-audio-us-female="/audios/us/intersect-us-female.mp3"></span>
+
+19. **sent/sens** (feel)
+    - sensation <span class="pho alt">senˈseɪ.ʃən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/sensation-us-male.mp3" data-audio-us-female="/audios/us/sensation-us-female.mp3"></span>
+    - sensitive <span class="pho alt">ˈsen.sə.t̬ɪv</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/sensitive-us-male.mp3" data-audio-us-female="/audios/us/sensitive-us-female.mp3"></span>
+    - consent <span class="pho alt">kənˈsent</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/consent-us-male.mp3" data-audio-us-female="/audios/us/consent-us-female.mp3"></span>
+
+20. **spec/spect** (look)
+    - inspect <span class="pho alt">ɪnˈspekt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/inspect-us-male.mp3" data-audio-us-female="/audios/us/inspect-us-female.mp3"></span>
+    - spectator <span class="pho alt">spekˈteɪ.t̬ɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/spectator-us-male.mp3" data-audio-us-female="/audios/us/spectator-us-female.mp3"></span>
+    - spectacle <span class="pho alt">ˈspek.tə.kəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/spectacle-us-male.mp3" data-audio-us-female="/audios/us/spectacle-us-female.mp3"></span>
+
+21. **struct** (build)
+    - construct <span class="pho alt">kənˈstrʌkt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/construct-us-male.mp3" data-audio-us-female="/audios/us/construct-us-female.mp3"></span>
+    - structure <span class="pho alt">ˈstrʌk.tʃɚ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/structure-us-male.mp3" data-audio-us-female="/audios/us/structure-us-female.mp3"></span>
+    - destruct <span class="pho alt">ˌself.dɪˈstrʌkt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/destruct-us-male.mp3" data-audio-us-female="/audios/us/destruct-us-female.mp3"></span>
+
+22. **tele** (far)
+    - telephone <span class="pho alt">ˈtel.ə.foʊn</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/telephone-us-male.mp3" data-audio-us-female="/audios/us/telephone-us-female.mp3"></span>
+    - television <span class="pho alt">ˈtel.ə.vɪʒ.ən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/television-us-male.mp3" data-audio-us-female="/audios/us/television-us-female.mp3"></span>
+    - telegraph <span class="pho alt">ˈtel.ə.ɡræf</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/telegraph-us-male.mp3" data-audio-us-female="/audios/us/telegraph-us-female.mp3"></span>
+
+23. **terra** (earth)
+    - terrestrial <span class="pho alt">təˈres.tri.əl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/terrestrial-us-male.mp3" data-audio-us-female="/audios/us/terrestrial-us-female.mp3"></span>
+    - territory <span class="pho alt">ˈter.ə.tɔːr.i</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/territory-us-male.mp3" data-audio-us-female="/audios/us/territory-us-female.mp3"></span>
+    - terrain <span class="pho alt">təˈreɪn</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/terrain-us-male.mp3" data-audio-us-female="/audios/us/terrain-us-female.mp3"></span>
+
+24. **vac** (empty)
+    - vacant <span class="pho alt">ˈveɪ.kənt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/vacant-us-male.mp3" data-audio-us-female="/audios/us/vacant-us-female.mp3"></span>
+    - vacuum <span class="pho alt">ˈvæk.juːm</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/vacuum-us-male.mp3" data-audio-us-female="/audios/us/vacuum-us-female.mp3"></span>
+    - evacuate <span class="pho alt">ɪˈvæk.ju.eɪt</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/evacuate-us-male.mp3" data-audio-us-female="/audios/us/evacuate-us-female.mp3"></span>
+
+25. **vid/vis** (see)
+    - video <span class="pho alt">ˈvɪd.i.oʊ</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/video-us-male.mp3" data-audio-us-female="/audios/us/video-us-female.mp3"></span>
+    - vision <span class="pho alt">ˈvɪʒ.ən</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/vision-us-male.mp3" data-audio-us-female="/audios/us/vision-us-female.mp3"></span>
+    - invisible <span class="pho alt">ɪnˈvɪz.ə.bəl</span> <span class="speak-word-inline" data-audio-us-male="/audios/us/invisible-us-male.mp3" data-audio-us-female="/audios/us/invisible-us-female.mp3"></span>
+
diff --git a/1000-hours/sounds-of-american-english/5-sumup.md b/1000-hours/sounds-of-american-english/5-sumup.md
new file mode 100644
index 00000000..6ed8c6fe
--- /dev/null
+++ b/1000-hours/sounds-of-american-english/5-sumup.md
@@ -0,0 +1,14 @@
+
+# 5. 总结（Sum up）
+
+其实，读音与拼写，就是学英语的 “最少必要知识” 了。所谓的 “最少必要知识”，指的是那些实际上很少很少，却可以做到 “只要掌握了之后就可以开始有资格有资本自顾自前行” 的知识。
+
+Actually, pronunciation and spelling are the "minimum necessary knowledge" for learning English. "Minimum necessary knowledge" refers to the very basic yet crucial information that, once mastered, allows you to move forward independently.
+
+练好了正确发音，掌握了基本的拼写，接下来就可以直接用英语了。尤其是在人工智能已经在语言学习方面超越了所有英语老师甚至英语词典和语法书的今天。有什么不懂的，有什么不会的，直接问人工智能就可以了。它的答案一定是最好的（尤其是在英语方面），剩下的，只有一件事，用。在用的过程中练，在练的过程中用。
+
+If you get your pronunciation right and learn basic spelling, you can start *using* English *right away*. This is especially true today when artificial intelligence has surpassed all English teachers, dictionaries, and grammar books in language learning. Whenever there's something you don't understand, you can just ask AI. Its answers, particularly for English, will be the best. After that, there's only one thing left to do: *practice*. *Use* English in practice and *practice* while using it.
+
+祝你好运！
+
+Good luck!