49. ______ that he has no qualifications in education management, the man plans to gain the necessary skills by taking a part-time course.

　 A. To concern　　　 B. To be concerned　　 C. Concerning　 　　D. Concerned　

48. Everyone here will thank the firefighters for the things they have done to prevent fires ______ the environment safer.

A. make　　 B. to making　　 C. to make　　 D. from making

47. As the light turned green, I stood for a moment, not _____, and asked myself what I was going to do.

　 A. moved　　　　　 B. moving　　　　　 C. to move　　　　 D. being moved　　

46. _____ you keep on trying, I don’t really mind whether you can come out top in your class.

A. So long as　　　　　　　　B. As soon as　　 　　C. Once　　　　　　　　　　　D. The moment

45. _____ is known to the world, China’s Liu Xiang became the first Asian in history to win the men’s 110m hurdles at the Olympic Games.

　 A. That　　　　 　　　B. Which　　　　　　　 　C. As　　　　　　　 D. It

44. ---- What’s wrong with your coat?

　 ---- Just now when I wanted to get off the bus, the man next to me ______ on it.

　 A. sat　　　　 　B. had sat　　　　 C. had been sitting　　　 D. was sitting

43. My cousin went to Canada two years ago. He ______ there for a few months and then went to American.

　 A. worked　　　 B. would work　　　 C. would be working　　 D. has been working

42. They _______ on the program for almost one week before I joined them, and now we _____ on it as no good results have come out so far.

　 A. had been working; are still working　　 B. had worked; were still working

　 C. have been working; have worked　　　 D. have worked; are still working

41. ---- Is he said _____ his car lost?

　 ---- Yes. He was so foolish _______ leave his car ______.

　 A. that; that; unlock　　　 B. to have had; as to; unlocked

　 C. to have; to; unlock　　　 D. to have; for him to; unlocked

40. No one ______ this building without the permission of the police.

　 A. is leaving　　　 B. is to leave　　 C. has left　　　 D. will be leaving