39. It was not until she got home __________ Jennifer realized she had lost her keys.

　 A. when　　　　 B. that　　　　 C. where　　　　 D. before

38. His failure in the plan made him aware __________ he had made a great mistake in working out the plan.

　 A. of that　　　 B. of　　　 C. that　　　　 D. that of

37. Tigers __________ meet-eating animals _________ meats.

　 A. belonged to; feed on　　　　　　　 B. belonging to; feed on　

　 C. were belonged to; feed on　　　　　 D. belonging to; feeding on

36. The noise of the train __________ in the dark night.

　 A. died out　　　　 B. died from　　　　 C. died away　　　 D. died off

35.The manager of the company told us that very little _________ was made of the waste material in the past.

　 A. cost　　　　 B. value　　　 C. use　　　　 D. matter

34. __________ I explained on the phone, your request will be considered at the next meeting.

　 A. When　　　　 B. After　　　 C. As　　　　　 D. Since

33. If you want to visit the museum, I recommend ___________ there by underground.

　 A. you to go　　　　 B. going　　　　 C. you went　　　　 D. to going

32. He is going into hospital to have a small __________ her knee.

　 A. operate on　　　 B. operation for　　　 C. operation to　　　　 D. operation on

31. ___________ in experience, she didn’t manage to pass the interview.

　 A. Lack　　　　 B. Lack of　 　　C. For lack of　　　　 D. Lacking

30. Stress can be extremely damaging to your health. Exercise, __________, can reduce its effects.

　 A. at the same time　　　　 B. while　　　 C. though　　　 D. meanwhile