单词分类。 1. fifteen-year-olds 4. have part-time jobs 7. calm 10. old 13. go out with friends 2. serious 5. teenagers 8. get one's ears pierced 11. choose one's own clothes 14. wild 3. kids 6. students 9. silly 12. be home by 10 p.m 15. the young 用于指人_____ _____ ______ _____ ______ 家规校规_____ _____ ______ _____ ______ 人物特点_____ _____ ______ _____ ______