Researchers have come to the conclusion over the last 5 years ________ teens need to sleep until about 8∶00 the next morning．

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• 1They have no idea ________ in the world．

  A.how many kinds of living things are there

  B.how many kinds of living things there are

  C.there are how many kinds of living things

  D.that how many kinds of living things there are

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• 2________ came ________ our schoolmaster will go abroad next month．

  A.The word;which

  B.Word;that

  C.Words;which

  D.The word;that

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• 3________ no doubt ________ China will become an advanced country in the future．

  A.It; whether

  B.There is; that

  C.It is; that

  D.There is; whether

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• 4There is no doubt ________ my friend was not important to them all．

  A.that

  B.whether

  C.if

  D.why

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• 5There is no doubt ________ his history．

  A.whether

  B.if

  C.that

  D.about

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• 6There is no doubt ________ you will pass the exam this time．You have worked so hard in the past months．

  A.whether

  B.that

  C.if

  D.what

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• 7When I watched the film, I slowly became aware of the fact ________ cultural differences couldn't stop people understand each other．

  A.which

  B.where

  C.whether

  D.that

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• 8There is no doubt ________ my friend Smith will come to visit China soon．

  A.that

  B.whether

  C.if

  D.when

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• 9Have you got the message I left with your mother ________ you'll have a meeting tomorrow afternoon？

  A.in which

  B.with whom

  C.that

  D.which

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• 10We heard the news ________ she set a new world record in swimming．

  A.what

  B.whether

  C.how

  D.that

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