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五道英语题,望能说明原因?

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五道英语题,望能说明原因?
21. The 2010 Shanghai World Expo is intended to achieve our common goal: ________world that is safer, cleaner and healthier than ________ one we’re liv ing in.A. the; the                 B. a; /                C. a ; the                  D. the ; /   28. --- Did you often e-mail your family during the first year at university?   --- No. I was so busy meeting new people that I didn’t write to my family as I _____.    A. ought to           B. should do             C. should have written   D. should have30. Mr. Fox fell ill, thus __________ it necessary for us to find another person for his job.A. having made              B. made                  C. making               D. to make31. Further space exploration has been _______ with the rapid development of China’s science and technology.A. made it possible                                      B. made possible          C. made it possibly                                            D. made possibly 35. --- I’m thinking of the test tomorrow. I’m afraid I can’t pass this time.   --- _______! I’m sure you’ll make it.A. Go ahead                    B. Good luck                    C. No problem                 D. Cheer up
五道英语题,望能说明原因?
21.C 2010上海世博会是为了达成我们的共同目标:一个比我们现在居住的世界更安全,更干净,更健康的世界.(第一空是指一个新的世界 第二空是特指我们现在居住的世界 所以应该加上定冠词the)
28.C -你在你大学第一年经常跟你的家人发邮件吗?- 没有.我忙于认识新的人一直月我没有像我本应该做的那样给我的家人写信.(should have done 是固定搭配 意思是本应该做某事)
30.