21. Since 2003 they ______ their son every year. a. visited b. have visited c. visit d. will visit 22. Usually, Mr. Pile ______ us Physics but today he ______ill, so Mrs. Young ______ us a. teaches/ is/ is teaching b. has taught/ is / teaches c. is teaching/ has been/ teaches d. taught/ was/ was teaching 23. I am sorry I can't hear what you ______ because everybody ______ so loudly. a. are saying/ will talk b. was saying/ has talked c. have just said/ is talking d. said/ was talking 24. I ______ the same car for more than ten years. I ______ about buying a new one. a. have had/ am thinking b. will have/ think c. had/ will think d. am going to have/ was thinking 25. My best friend and I ______ each other for over fifteen years. We still ______ together once a week. a. were knowing/ got b. knew/ have got c. have known/ get d. had known/ are getting 26. The secretary ______ on the report for more than three hours. She hopes she may finish it by the lunch time. a. is working b. will be working c. has been working d. had been working 27. Please turn off the stove. The water ______ for more than fifteen minutes. a. is boiling b. was boiling c. has been boiling d. will be boiling 28. In the 19th century, it ______ two or three months to cross North America by covered wagon. The trip _____ very rough and often dangerous.. a. took/was b. had taken/ had been c. took/ had been d. had taken/ was 29. My grandfather ______ a very exciting life. When he was young, he ______ on the farm in the country, where there ______ a lot of cattle and meadows. a. has/ has lived/ have been b. had/ lived/ were c. was having/ had lived/ had been d. has had/ is living/ are 30. Mary _____ on the essay for two hours now and she _____ that she _____ it in one more hour. a. is working/ has hoped/ can finish b. has been working/ hopes/ will finish c. will have worked/ hopes/ finishes d. had been working/ hoped/ would finish 31. I ______ there once a long time ago and ______ back since. a. went/ have not been b. have gone/ will not be c. was going/ am not d. had gone/ was not 32. Those drivers ______ for three hours when a heavy storm suddenly ______ a. were driving / broke b. drove/ was breaking c. had driven/ was breaking d. had been driving/ broke 33. I ______ to visit you yesterday, but you ______ at home. a. have come/ are not b. had come/ were not c. came/ were not d. was coming/ have not been 34. What ______ when the accident ______ ? a. have you been doing/ occurs b. are you doing/ will occur c. will you be doing/ has occurred d. were you doing/ occurred 35. We ______ TV when it ______ to rain a. are watching/ will start b. have watched/ will be starting c. had watched/ was starting d. were watching/ started