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单项填空。(共10小题，每小题1分，满分10分)

从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

13. People in this great city are proud of ___________ they have achieved in the past ten years.

A. what             B. which             C. that             D. how

14. More visitors ___________ to Beijing since the repair project was completed.

A. were brought                           B. are brought

C. will be brought                         D. have been brought

15. —Is Pro. Smith giving the speech today?

—It ___________ be him. He is abroad right now.

A. won’t             B. needn’t             C. can’t             D. mustn’t

16. The clever boy made a hole in the wall, ___________ he could see what was going on inside the building.

A. through which     B. at which            C. on which         D. in which

17. Parents are taught to understand ___________ important education is to their children’s future.

A. that             B. such               C. so                D. how

18. I had neither a raincoat nor an umbrella. That’s why I ___________ wait until the rain stopped.