21. You told me _____ to do with the waste, but now I don’t know _____ to deal with this problem.

　　 A. what; what　　　　　　　 B. what; how　　　　　　　　 C. how; how　　　　　　　　 D. how; what

20. I met one of my friends in the street _____. We decided to have an outing _____.

A. some day; one day　　　　　　　　　　　　　　　　　　　 B. one day; some day

C. some day; some day　　　　　　　　　　　　　　　　　　 D. a day; some day

19. It is raining now. We have no choice _____ at home.

A. but stay　　　　　　 B. but to stay　　　　 C. but staying　　　　 D. and stay

18. There are trees on _____ side of the road.

　　 A. both　　　　 　　　　　 B. every　　　 　　　　　　 C. all　　　　 　　　　　　 D. either

17. Would you lend me the bike ____ you often come to school?

　　 A. on which　 　　　　　　　　　　 B. by which　 　　　　　　 C. in which　 　　　　　　　 D. with which

16. The “orphans” home in the old society was ____ a living hell, where children suffered from inhuman treatment.

A. as far as　　 　　　　　 B. much better than 　　 C. no better than　 　　　　 D. not better than

15. We had hardly left the house _____ it began to rain.

　　　 A. until　　　 　　　　　　 B. while　　　 　　　　　 C. before　　　 　　　　　 D. when

14. I didn’t get a good understanding of the complicated sentence _____ the teacher had explained it to me.

　　 A. before 　 　　　　　　　　　 B. until　 　　　　　　　　　 C. when　　　　 　　 　　　　　　　 D. unless

13. --- What was the party like?

--- Wonderful. It is years ____ I enjoyed myself so much.

A. after　　　　 　　　　　 B. before　　　　 　　　　 C. when　　　　 　　　　 D. since

12. I came back not _____ the rain, but _____ I was tired.

　　 A. because; because　　　 　　　　　　　　　　　　　　　 B. because of; because of

C. because; because of　　 　　　　　　　　　　　　　　　 D. because of; because