用所给单词的正确形式填空。 1. The joke is _______ (fun). We all laugh. 2. Where is the _______ (happy)? It's in your own hands. 3. My mother was _______ (satisfy) with what I did. 4. Don't let him _______ (go) there alone. 5. Have you finished _______ (read) the book? 6. All the students are busy _______ (clean) the room. 7. Did you hear the baby _______ (cry) in the next room? 8. Jack went to school without _______ (take) his backpack.