So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there _______ .

试卷相关题目

• 1You don't _____ to go there if you have no time.

  A.need

  B.want

  C.must

  D.ought

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• 2--- ' ______ he open the door?' --- 'Yes, please.' 

  A.Shall

  B.Will

  C.Can

  D.Would

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• 3______ you succeed, you ______ many hours.

  A.Would, would give

  B.Should, would be given

  C.Could, would be given

  D.Had, would be given

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• 4Helen is on time for everything. How ______ it be that she was late for such an important interview?

  A.might

  B.can

  C.must

  D.may

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• 5Visitors ________ take an animal or any other item prohibited by the Expo Bureau to the Expo Park.

  A.needn't

  B.may not

  C.mustn't

  D.will not

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• 6. “You ______ not be too careful in the exam. Do and check your papers carefully and you ____ not take your papers out of the examination room after the exam.” the teacher told us before the exam.

  A.must; should

  B.can; shall

  C.must; shall

  D.can; could

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• 7. Research findings show we spend about two hours dreaming every night, no matter what we ____ have done during the day.  

  A.should

  B.would

  C.may

  D.must

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• 8--- What has happened to Alice ? --- I don't know. She________ her job.

  A.can have lost

  B.may have lost

  C.should have lost

  D.need have lost

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• 9We ______ last night, but we went to the concert instead.

  A.must have studied

  B.might study

  C.should have studied

  D.would study

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• 10. If the water hadn't been drained out of the mine, no miners _______ alive now.

  A.will be

  B.would have been

  C.would be

  D.have been

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