38. Mr. Black ______ home because his briefcase is still on the desk.
A. mustn’t have gone B. can’t have gone
C. shouldn’t have gone D. needn’t have gone
37. All animals, ______ their size, breathe once for every four heartbeats.
A. however B. whatever
C. no matter D. in spite of
36. ______ has helped to save the drowning girl is worth praising.
A. Who B. No matter who
C. Anyone D. Whoever
35. ______ the house prices have risen sharply, the number of buyers is as great as ever.
A. Despite the fact that B. In spite of what
C. Regardless of D. Contrary to
34. Is this the reason ______ at the meeting for his carelessness in his work?
A. why he explained B. he explained
C. what he explained D. how he explained
33. Great honors will be given to ______ have successfully rescued the victims of the earthquake.
A. those who B. whoever
C. who D. whom
32. The traffic problems we were looking forward to seeing ______ should have attracted the government’s attention.
A. solving B. solve
C. to solve D. solved
31. The decision ______ Internet addiction(成瘾)as a mental disorder has caused much debate.
A. to classify B. classifying
C. being classified D. to be classified
30. As we watched the panda, we stood still, ______ to one another.
A. dared hardly to whisper B. hardly daring to whisper
C. dared not to whisper D. not dared whisper
29. Contrast may make something appear more beautiful than it is when ______ alone.
A. seen B. to be seen
C. being seen D. having been seen