50. Time should be made good use of ____ our lessons well.

A. learning　　 　　　　 B. learned　　 　　　　　　 C. to learn　　 　　 D. having learned

第九章 非谓语动词

49. Unless______ to speak, you should remain silent at the conference.

A. invited　　 　　　　　 B. inviting 　　　　　 C. being invited 　　　　 D. having invited

48. ______the meeting himself gave them a great deal of encouragement.

A. The president will attend　 　 　　　　　　　　　　 B. The president to attend

　C. The president attended　 　 　　　　　　　　　　 D. The president’s attending

47. Friendship is like money, easier made than ____.

　A. kept　 　 　　　　　 B. to be kept 　　　　　 C. keeping　 　　　　 D. being kept

46. Don’t be discouraged. ______ things as they are and you will enjoy every day of your life.

　A. Taking　　 　　　　　 B. To take 　　 　　　 C. Take　 　 　　　 D. Taken

45. The man we followed suddenly stopped and looked as if _______ whether he was going in the right direction.

　A. seeing　　 　　　　　 B. having seen 　 　　　　　　　 C. to have seen 　 D. to see

44. The manager,______ his factory’s products were poor in quality, decided to give his workers further training.

　A. knowing　 　　　　　 B. known　　 　　　　　　　　　　 C. to know　 　　　　　　　 D. being known

43. -What do you think made the woman so upset？

-_____ weight. 　A. As she put on　 　　 B. Put on　　 　　　　　　　 C. Putting on　　 　　　 D. Because of putting on

42. There is a new problem involved in the popularity of private cars_______ road conditions 　need ______.

A. that…to be improved　 　 　　　　　　　　　 B. which…to be improved

C. where…improving　　 　　　　　　　　　　　　 D. when…improving

41. An army spokesman stressed that all the soldiers had been ordered_______ clear warnings

before firing any shots.

A. to issue 　　 　 B. being issued 　　　　 C. to have issued 　　　　 D. to be issued