50. According to my grandparents, it is a good idea to eat chicken soup when you have a cold.　 __　　 　, scientists agree with them.

A. Sooner or later　 B. Once in a while　　 C. To be exact　　　 　 D. Believe it or not

49. Wind power is an ancient source of energy 　　　　we may return in the near future.

A. on which　　　 B. by which　　　　　 C. to which 　　　　　 D. from which

48. ---More and more high-rise buildings have been built in big cities 　　　　　space.

　 ---I couldn’t agree more.

A. in search of　　 B. in place of　　　　 　 C. for lack of　　　 D. for fear of

47. I have seldom seen my mother ________ pleased with my progress as she is now.

A. So　　　　　　 B. very　　　　　 　　　 C. too　　　　　　 D. rather

46. Jack took the boxes off the little table to make _______ for the new computer.

A. area　　　　　 B. room　　　　　　 　C. field　　　　　 D. position

45. Though ______ to see us，the president gave us a warm welcome and showed us around.

A. surprise　　　　 B was surprised　　 　 C. surprised　　 D. being surprised

44. The settlement is home to nearly 1,000 people, _____ left their village homes for a better life in the city.

　 A. many of those　 B. many of which　　 C. many of them　　　 D. many of whom

43. ---Is everyone here?

---Not yet. Look, there_______ the rest of our students!

A. come　　　　　 B. comes　　　　　 C. is coming　　　 　　　　　 D. are coming

42. It was from only a few supplies that she had bought in the village 　　　　　the hostess cooked such a nice dinner.

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