21. He collects stamps and has a very good c　　　 .

20. Sally’s father likes fishing, but Tom’s father likes m　　 　biking.

19. I s　　　 　about an hour playing basketball every afternoon.

18. I　　　 　is not easy to understand this book.

17. Jay is not only a singer, but a　　　 　an actor.

16. Collecting stamps is a p　　　 　hobby. A lot of people like it.

15. It doesn’t matter, but don’t be late n　　 　time.

14. You can see the hospital at the e　　　 　of Chang’ an Jie.

13. Some hobbies can h　　　 　us learn new skills.

12. We should learn f　　 　Comrade Lei Feng.