_______ some doubt among scientists about the cause of cancer.

试卷相关题目

• 1Eugene's never willing to change any of his opinions. It's no use _____ with him.

  A.to argue

  B.arguing

  C.argued

  D.having argued

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• 2News shocked the world _________ a Russian jet carrying members of a local hockey team crashed.

  A.which

  B.what

  C.that

  D.where

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• 3It was the third time that the boy _________ late. So his teacher got very angry.

  A.have been

  B.was

  C.had been

  D.was being

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• 4? Do you know the most ancient city in China ─ Xi'an well? ? No, this is the first time I ___________ here.

  A.came

  B.have come

  C.am coming

  D.come

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• 5'______ Libya's oil production returns to normal, I guess, it will be fifteen months,' said a UN expert．

  A.After

  B.That

  C.Before

  D.Since

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• 6----You haven't been to Beijing, have you? ----_____. How I wish to go there!

  A.Yes, I have

  B.Yes, I haven't

  C.No,I have

  D.No,I haven't

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• 7----It shouldn't take long to clear up after the party if we all volunteer to help． -----That's right．________ ．

  A.Many hands make light work．

  B.Something is better than nothing．

  C.The more, the merrier．

  D.The sooner begun, the sooner done．

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• 8Find ways to praise your children often, _______ you'll find they will open their hearts to you.

  A.till

  B.and

  C.or

  D.but

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• 9For many years we have been keeping in _______ by sending each other e-mails or phone calls.

  A.connection

  B.contrast

  C.relation

  D.touch

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• 10 ______ good manners to say “Sorry” when you knock into someone but ______ no need to say it again and again .

  A.There are ; there is

  B.It is ; there is

  C.There is ; it is

  D.It is ; it is

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