20. I ______your address, otherwise I______you long before.

　 A. had forgotten,had visited　　 　　 B.forgot, have visited　　

　C. forgot,would have visited　　 　　 D.have forgotten,would visit

19. The young man insisted that he______ these watches and______free.

　　 A. stole, set　　　　　 B. had stolen, be set 　　C. steal, be set　　 　　　　　 D. had stolen； must be set

18.-Would you have told him the answer had it been possible?

　 -I would have, but I ______so busy then.

　 A. had been 　　　　　B. were　 　　　　　　C. was　 　　　　　　　　D. would be

17.- It is rather cold here. Shall we light a fire?

　 - No, we______because things are easy to catch fire.

　 A. won’t　　 　　　　　B. can’t　 　　　　　　　C. mustn’t 　　　　　　　D. needn’t

16. Even though I’d hurt my leg, I______swim back to the river bank.

　 A. could　 　　　　　　B. might　 　　　　　　C. had to　　 　　　　　　D. was able to

15. -Do you think he will do me a favor?

　 - As far as I know, he is the last one to help others. He______be prepared to give you a hand, though.

　 A. might　 　　　　　B. must　 　　　　　　　C. can　 　　　　　　　　D. should

14. Hurry up,Tom.It’s high time we______ to the theater.

　 A. will　 　　　　　　　B. shall　　 　　　　　　C. are going to　 　　　　　D. went

13. What ______ had Bob walked farther, as far as the river bank?

　 　A. would happen　　　 B.could happen　 　　　C. would have happened 　　D.needn’t have happened

12. - What happened to the young trees we planted last week?

　 -The trees______well, but I didn’t water them.

　 A. might grow　 　　 　　　 B. needn’t have grown　　 C. would grow　　　　 　　 D. would have grown

11.- I hear you’ve got a set of Australian coins. ______I have a look?

　 - Yes, certainly.

　 A. Do　　　 B. May　　　 C.Shall　　　 D. Should