21. I ___ my work by the time the teacher ____ back.

　 A. was finished.., came　　 B. shall have finished.., comes

　 C. had finished.., comes　　 D. have finished.., will come

20. The little boy is dirty from head to foot because he ___ in the mud all morning.

　 A. has played　　 B. is playing　　 C. has been playing　　　 D. was playing

19. Now that she is out of job, Lucy ____ going back to school, but she hasn't decided yet.

　A. had considered　　 B. has been considering　 C. considered　　 D. is going to consider

18. Although these scientists ____ on the project for nearly four years,　 I don't know how long it will last.

　A. have been working　　 B. had worked　 C. were working　　　　 D. are working

17. - There is so much snow these days, isn't there?

　 - Yes, it ____ for a few days.

　 A. was snowing　　 B. has been snowing　 C. had been snowing　　　　 D. snowed

16. -- Hi, Tracy, you look tired.　　　　 -- I'm tired. I ___ in the living room all day.

　 A. painted　　　 B. had painted　　　 C. have been painting　　　　 D. have painted

15.There came the news that the visiting team had gained a victory　　　　 the home team with a score of 4 to 3.

　A. against　　　　　 B. toward　　　　 C. upon　　　　　　　 D. over

14.When I watched the film, I slowly became aware of the fact　　　 cultural differences couldn't stop people understanding each other.

　A. which　　　　　　 B. where　　　　　 C. whether　　　　　 D. that

13. As far as I am concerned ,education is about learning and the more you learn,

　　　　　 A. the more for life are you equipped

　　　　　 B. the more equipped for life you are

　　　　　 C. the more life you are equipped for

　　　　　 D. you are equipped the more for life

12.I felt very disappointed when my repeated request that I join the club was

　 A. replaced　　 B. resisted　　　　 C. rejected　　　　 D. removed