50. She is an excellent student in our class, and she always 　　　　　herself in her studies.

　 A. hides　　　　　　 B. buries　　　　　　 C. covers　　　　　 D. leaves

49. In that big earthquake all their houses were 　　　　, so they had to build new ones.

　 A. hurt　　　 B. harmed　　　 C. injured　　　　　 D. destroyed

48. 　　　　　never to come back before he could make a big fortune, Mike left home without saying a word.

　 A. Determining　　　 B. Determined　　　 C. Being determined　　　 D. Decided

47. Mrs. Smith has tried many times to persuade her husband to give 　　　　　smoking, but Mr. Smith wouldn’t listen, Finally Mrs. Smith had to give 　　　　　and let him be.

　 A. in; in　　　　　　 B. up; up　　　　 C. up; in　　　　 D. in; up

46. The farm grows various kinds of crops, 　　　　　wheat, corn, cotton, and rice.

　 A. for example　　　 B. as　　　　　 C. so that　 　　　D. such as

45. Of these two basketball teams, the former comes from the US; the 　　　　　comes from England.

　 A. late　　　　　　 B. later　　　　　　　 C. latter　　　　　 D. lately

44. She understood what I was talking about, 　　　　　it was the first time we had spoken together.

　 A. whether　　　　 B. even though　　　　 C. as though　　　 D. since