I can still remember that it is since the 1990's, _____ we began to use cell phones,_______ the number of mobile users has greatly increased．

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• 1—So you know Della? —Yes, it was last week__________I surfed the Internet.

  A.that

  B.when

  C.why

  D.Whom

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• 2China isn't the country _________ she used to be 50 years ago.

  A.that

  B.which

  C.what

  D.since

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• 3Although he knew little about the large amount of work done in the field , he succeeded _____ other more well-informed experimenters failed.

  A.as

  B.unless

  C.what

  D.where

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• 4I was about to leave _____ the telephone rang.

  A.then

  B.when

  C.that

  D.and when

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• 5Reading offers only material of knowledge, without thinking, however, it's hardly possible to make ______ we read ours.

  A.that

  B.what

  C.how

  D.It

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• 6_____I saw the West Lake, I was struck by its beauty.

  A.The first time

  B.For some time

  C.For the first time

  D.At the first time

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• 7Several weeks had gone by____________I realized the painting was missing.

  A.as

  B.before

  C.since

  D.when

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• 8________ the Internet is of great help, I don't think it's a good idea to spend too much  time on it.

  A.While　

  B.As　

  C.Because　

  D.If

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• 9He waited until it was dark ____ nobody could see him clearly.

  A.so that

  B.in order to

  C.although

  D.However

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• 10“You can't have your football back ____ you promise not to kick it at my dog again,” the woman said firmly.

  A.until

  B.when

  C.since

  D.because

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