It was such a difficult problem _______ few students in our class worked out．

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• 1The reason why he didn't attend the meeting is ______ he stayed up late last night.

  A.because

  B.what

  C.for

  D.that

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• 2Whether life will continue on the earth for millions of years ______will depend on ____this problem can be solved.

  A.to come; if

  B.coming; if

  C.to come; whether

  D.coming; whether

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• 3It was in the museum ______ I came across my best friend.

  A.where

  B.which

  C.that

  D.when

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• 4I wonder ______ we haven't received her invitations yet. Her wedding is only two days away.

  A.how

  B.why

  C.that

  D.when

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• 5____ you know your potential（潜力）, you have to rely on many other people to get to where you are.

  A.While

  B.Since

  C.If

  D.Where

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• 6Mr．Green asked the naughty boy to be away from her window, _____ she would call his parents．

  A.and

  B.so

  C.then

  D.otherwise

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• 7The reason why he succeeded is ______ he worked very hard.

  A.why

  B.that

  C.whether

  D.how

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• 8My father likes outdoor activities,_______ my mother prefers staying at home.

  A.when

  B.while

  C.after

  D.before

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• 9The Time Traveler stops 30 million years into the future and experiences a future time _____ the sun no longer shines brightly.

  A.where

  B.when

  C.which

  D.and

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• 10The reason why I burst into tears is _________ I don't want to part with my mother.　　　　　　

  A.that

  B.because

  C.what

  D.which

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