21. As she ________ a letter last night, the lights suddenly ________ out. A. was writing/ went B. wrote/ went C. was writing/ was going D. writes/ went 22. How ________ since we ________ school? A. are you/ left B. will you be/ had left C. have you been/ had left D. have you been / left 23. I ________ my uncle’s home many times when I ________ a child. A. visited/ is B. visits/ was C. visited/ was D. visited/ were 24. It ________ me half an hour to get to the supermarket yesterday. A. take B. takes C. took D. spent 25. If I were you, I ________ him as my nephew. A. will treat B. would treat C. will have treated D. am treating 26. I can’t believe that my expensive bicycle ________ last night. A. was stolen B. was stealing C. is stolen D. stole 27. I ________ here for more than 10 years. A. have taught B. taught C. teach D. is teaching 28. As I ________ my homework, he came yesterday afternoon. A. did B. were doing C. am doing D. was doing 29. At this time yesterday, everyone ________. in the room. A. is dancing B. was dancing C. dances D. danced 30. After Mary________ her degree, she intends to work in her father's company. A. will finish B. is finishing C. finishes D. will have