49. --- Could I use your bike?　　　　　 　　　　　 --- Yes, you ______.

A. could 　　　　 B. can　　　　　　　 C. should　　　　 D. will

48. --- Must I finish all the work in one evening?　　　 --- No, you ________.

A. mustn’t　　　 B. haven’t　　　 C. don’t have to 　　 D. needn’t to

47. The problem is too complex. We ought to _______ a specialist.

A. call on　　　　 B. call at　　　　　 C. call for　　　　 D. call in

46. These wild flowers ______ a nice smell.

A. gives out 　　 B. sends out 　 C. give off　　　　 D. send off

45. The room ______ 10 meters across.

A. is　　　　　　　　 B. measures　　 C. is measured　 　 D. A or B

44. When you listen to a teacher, ________ what you think is important.

A. write　　　　 B. make notes of 　　　　　　　　　　　 C. take notice　 D. hear　

43. ________ can we finish the work within three days.

A. By no way　 B. In this way　 C. By no means D. By this means

42. You can arrive in Guangzhou on time for the fashion show ______ you don't mind taking the night train.

A. provided　　　 B. unless　　　　　 C. though　　　　 D. until

41. ______ sharks are heavier than water, they must swim continuously or they will sink to the bottom.

A. Since　　　　　 B. Though　　　 C. When　　　　　 D. Once

40. ______ I entered, he was _____ in his book and didn’t notice me.

A. When; devoted　　　　　　　　　　 B. While; absorbed 　　 C. When; absorbed　 D. While; devoted