A. think

　　B. thought

　　C. had thought

　　D. have thought

　　25. You can find almost whatever you need at the new shopping mall, ________ is always busy at the weekend.

　　A. as

　　B. where

　　C. that

　　D. which

　　26. Finally, I told them to move out. They ran to the boat, ________ excitedly.

　　A. shouting

　　B. shouted

　　C. having shouted

　　D. to shout

　　27. ________ according to the directions, the machine can be running smoothly.

　　A. When operate

　　B. When operated

　　C. When to operate

　　D. When to be operated

　　28. As you studied late yesterday, you ________ have got up so early to see me off this morning.

　　A. shouldn’t

　　B. needn’t

　　C. can’t

　　D. mustn’t

　　29. Though Newton was a great scientist, many of his ideas ________ today and are being improved by the work of today’s scientists.

　　A. are to challenge

　　B. have challenged

　　C. may be challenged

　　D. have been challenged

　　30. While people may refer to Internet for up-to-the-minute news, it is unlikely that Internet ________ the newspaper completely.

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