65. Recently I have been busy with a paper on pollution, so I can’t help ____ the housework

　at home.　 A. doing　 B. to do　　　　　 C. to make　　　 D. making

64. The rich counties must do whatever they can ____ others.

　 A. help　　　 　 B. helping　　　　　　 C. to help　　　　　　　　　　 D. to be helping

63. Mr Black is on time for everything. How ____ it be that he was late for the opening

　ceremony?　 A. can　　　 　　　 B. should　 D. may　　　　　　 D. must

62. “Excuse m. Is this the right way to the Summer Palace?

　 “Sorry, I am not sure. But it ____ be.　 A. might B. will　　 C. must　 D. can

61. “Tom graduated from college at a very young age.”

　 “Oh, he ____ have been a very smart boy then.”

　 A. could 　　　　 B. should　　　　 C. might　　　　 D. must

60. You ____ be tired. You’ve only been working for an hour.

　 A. must not　　　 B. won’t 　　　　　　　 C. can’t　　　　　 D. may not

59. ____ the day went on, the weather got worse.

　 A. With　　 B. Since 　　　　　　　 C. While　　　　 D. As

58. “How long had the bookstore been in business?”　　 “____ 1932.”

　 A. After　　　　　 B. In 　　　　　　 C. Afterwards　　　　 D. Since

57. ____ of the consequences. He did whatever he liked to and nobody could stop him.

　 A. Regarding　　 B. as regards　 C. Regardless　 D. With regard

56. The school should ____ immediately to the parents’ request that students attend classes

　on Sundays.　 A. answer　 B. obey　 C. follow　 D. respond