We（  ）make sure that our drinking water Is clean。

试卷相关题目

• 1They（  ）holding a meeting in the classroom at this moment。

  A.might be

  B.can be

  C.ought tobe

  D.should have been

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• 2He hurried up so that he（  ）get there before five o’ clock。

  A.can

  B.may

  C.might

  D.must

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• 3He told me I（  ）go and see him at any time。

  A.can

  B.should

  C.might

  D.would

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• 4（  ）anybody else give correct answers to these questions。

  A.should

  B.Can

  C.May

  D.Must

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• 5Under certain conditions, the bombardment（  ）produce brand-new elements never detected in nature。

  A.can

  B.must

  C.ought to

  D.need

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• 6“May I take the instrument out of the laboratory?” “No, you（  ）。”

  A.may not

  B.can not

  C.mightnot

  D.must not

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• 7The book（  ）in the drawer.it can’t be anywhere else。

  A.ought to be

  B.must have been

  C.must be

  D.can be

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• 8Apart from the sun itself, the sunny side of Mercury（  ）the hottest place in the solar system。

  A.mustnot lie

  B.must be

  C.can not be

  D.ought to be

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• 9They（  ）working in the workshop.Let's go there。

  A.must be

  B.might be

  C.can be

  D.should be

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• 10You（  ）starting you work .It's already eight o'clock。

  A.must be

  B.might be

  C.ought to be

  D.can be

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