21. In one year’s time, she________for this company for 15 years.
A. will be working B. will have been working
C. will work D. has worked
22. His health has improved a lot since he________doing exercises regularly.
A. starts B. started C. has started D. had started
23. She hurt herself while she________hide-and-seek with her friends.
A. is playing B. had played C. Played D. was playing
24.What________at 9 o’clock last night? I phoned you but couldn’t get through to you.
A. did you do B. were you doing C. would you do D. had you done
25. It is raining heavily with rolls of thunder. We________such a terrible thunderstorm.
A. would never see B. had never seen C. have never seen D. never see
26. I _______ my old teacher last week.
A. visited B. visit C. am visiting D. have visited
27. My brother usually ________me for help when he has any difficulties with his homework.
A. ask B. asks C. Asked D. has asked
28. I ______ all of my homework last night.
A. finish B. will finish C. have finished D. finished
29. Lan________ learning English a few years ago.
A. starts B. will start C. Started D. is starting
30. Only after she________from a severe illness did she realize the importance of good health.
A. would recover B. has recovered
C. had recovered D. was recovering
31. Only after the bus________for a few miles did Jane realize she was on the wrong route.
A. was running B. had run C. has run D. runs
32. The children________to bed before their parents came home from work.
A. were all going B. had all gone C. had all been going D. have all gone
33. Paul noticed a job advertisement while he________along the street.
A. was walking B. would walk C. Walked D. had walked
34. I haven’t met him again since we________school ten years ago.
A. have left B. leave C. Left D. had left
35. For the last 20 years, we________significant changes in the world of science and technology.
A. witness B. have witnessed C. Witnessed D. are witnessing