Water _______ be changed into vapour but it _______ be heated to its boiling point .

试卷相关题目

• 1He _________ to the party this afternoon if he has something important to do.

  A.needs not go

  B.needn't go

  C.doesn't need going

  D.doesn't need go

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• 2—My little daughter is coughing worse than ever. —She__________to the hospital yesterday.

  A.had to be taken

  B.should have taken

  C.must have been taken

  D.ought to have been taken

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• 3You _________ be hungry yet;you had a big cake only an hour ago.

  A.may not

  B.mustn't

  C.can't

  D.needn't 

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• 4He's working hard for fear that he__________.

  A.should fall behind

  B.fell behind

  C.may fall behind

  D.would fall behind

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• 5Mr. Brown, a good friend of mine, __________ us but that he was short of money at the time.

  A.would help

  B.would have helped

  C.had helped

  D.helped

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• 6The tourists didn't stop to rest at each station because it ______them down.

  A.had slowed

  B.would slow

  C.should have slowed

  D.would have slowed

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• 7—Tom didn't come last night,did he? —No.I _______ have waited for him.A whole night was wasted.

  A.would

  B.should

  C.couldn't

  D.needn't

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• 8Why _______ you keep troubling your mother with such question while he is busy .

  A.can

  B.will

  C.would

  D.must

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• 9--Listen! Someone is knocking at the door. -- ______ be Mary. She has just been to Beijing

  A.She mustn't

  B.It can't

  C.It must

  D.She may

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• 10Mary__________my letter;otherwise she would have replied before now.

  A.has received

  B.ought to have received

  C.couldn't have received

  D.shouldn't have received

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