It was not until 1911, _______ the first vitamin was identified, _______ people realized the importance of it．

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• 1It was __________ he took off his dark glasses __________ I realized he was a famous singer.

  A.until，that

  B.not until，that

  C.not until，when

  D.when，then

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• 2 ________ she is not so cheerful ________ she used to be?

  A.How is it that; as

  B.Why is it that; what

  C.Is it why; that

  D.How it is what; as

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• 3Personally, I think it's your attitude, rather than your score, ______ matters in your study.

  A.which

  B.that

  C.how

  D.what

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• 4It is you, I think, rather than your wife, _________ to blame for your son's bad behavior at school．

  A.that is

  B.who is

  C.that should

  D.who are

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• 5Was it in 2002 __________ he was still at middle school __________ the boy became expert at computer?

  A.that; where

  B.when; where

  C.that; when

  D.when; that

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• 6It is not how much we learn but how much we understand ______ benefits us so much in our daily life.

  A.which

  B.that

  C.what

  D.who

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• 7It was ________ back home after the experiment.

  A.not until midnight did he go

  B.until midnight that he didn't go

  C.not until midnight that he went

  D.until midnight when he didn't go

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• 8It was Mr Green _______ looked after my grandmother when I was on business.

  A.whom

  B.which

  C.whose

  D.who

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