In May 2011, Americans spent 53 billion minutes on Facebook, ______ it the most popular U.S. website.

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• 1They will send kids to college ________ it takes, even if that means a huge amount of debt.

  A.whoever

  B.however

  C.whatever

  D.whichever

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• 2The reason_______ his being late for school was______ he missed the train.

  A.for because

  B.why that

  C.why because

  D.for that

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• 3It's not necessary to explain the truth _____ there is spring wind, there is green grass．

  A.which wherever

  B.that which

  C.which when

  D.that wherever

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• 4I usually take something to read when I travel by train ________ I feel bored.

  A.in case

  B.so that

  C.as if

  D.even though

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• 5While dancing happily at home, _________ ．

  A.the door bell rang

  B.the door bell rings

  C.we heard the door bell rings

  D.we heard the door bell ring

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• 6Along with the letter was his promise _____ he would visit me this coming Christmas.      

  A.which

  B.that

  C.what

  D.whether

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• 7____ and we'll get everything ready for the taking off.

  A.Have one more hour

  B.If I have one hour more

  C.Given one more hour

  D.One more hour

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• 8All the photographs in this book, _______ stated otherwise, date from the 1950s.

  A.unless

  B.until

  C.once

  D.if

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• 9All 5 children of the Blacks, _______ are now working abroad, will come back for their parents' 50 th wedding anniversary.

  A.two of whom

  B.two of them

  C.both of whom

  D.both of them

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• 10He got up late and hurried to his office, ________ the breakfast untouched.

  A.left

  B.leaving

  C.to leave

  D.leave

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