12. C　 13. A　 14. A　 15. C　 16. B　 17. A　 18. C　 19. B

11. Where is the restaurant where you once worked in your spare time?

10. when, which (我将永远不会忘记那些我在乡村和农民一起生活和工作的日子. 这对我的人生有很大的影响.)

9. As is mentioned above, the number of the students in senior high schools is increasing.

7. C　　 8. As is known to everybody, the moon travels round the earth once every month.

5. A　　 　6. Is that the reason why/for which you had a few days off?

4. His parents wouldn't let him marry anyone whose family was poor.　　　　　　　　　　　　

3. After living in Paris for fifty years, he returned to the small town where he grew up as a child.

2. The weather turned out to be very good, which we hadn't expect.　　　　　　　　　

Practice:

1. which. (她听到一个恐怖的声音. 这让她的心快被提到嘴边来了.)