21.-I wonder how long you _____ in Hawaii.

-Just for the weekend, then I had to attend a conference in Los Angeles.

A.will stay　　　　　　　　　　　 B.were staying　　　　　　　　 C.have stayed　　　　 　　 D.stayed

20. -Miss wang once　　　　 art at Bardon School for ten years and now is a singer.

-No wonder I often hear her sing in the garden.

A. had taught　　　　　 B. taught　　　　　　 C. is teaching　　　 D. has been teaching

19. -I’m sure Andrew will come out first in this gymnastic competition.

-I think so. He ______　 for it for months.

A. is preparing　　　　 　 B. was preparing　　　 C. had been preparing　 　　　　 D. has been preparing

18. - Had we been more careful, the accident might not have happened.

- But we _____ at that time.

A. hadn’t　　　　　　 B. didn’t　　　　　 　C. weren’t　　　　 　　 D. might not

17. It’s reported that by the end of this year the output of cars of the factory　　　　 by about 20%

A.will have risen 　　　　　　 B.will be raised　　　 C.will rise 　　　　　　　 D.will have been risen

16. -Tom, it’s time that you _______your own clothes.

-I would rather you _______that for me just like before.

A. washed; had done　　　 B. wash; have done　　 C. washed; have done　　 D. wash; had washed

15. -I'm going to the USA.

-How long　　　 you　　　 there?

A. are; staying　　　　 B. are; stayed　　　　 C. have; stayed　　　　 D. did; stay

14. The news came as no surprise to me. I　　　　　 for some time that the factory was going to shut down.

A. knew　　　　　　　　　　　　 B. had known　　　　　　　 C. have known　　　　　　　 D. know

13. He will come to see you the moment he　　　　 his work.

A. will finish　　　　　　　　 B. finishes　　　　　　　　　　 C. would finish　　　　　　 D. had finished

12. The truck ran down the hill, and the driver _________, according to the local newspaper, to have been killed.

A. was reported　 　　 　　B. was reporting　 　　 C. reported　 　　　　 　D. had been reported