This building is both a secret and a mystery. No one shall be admitted into it ______ he can give the right password.

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• 1---- I wonder how much you charge for your services． ---- The first two are free ____  the third costs $30．

  A.while

  B.until　　

  C.when

  D.before

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• 2Maria looked around on the playground _______ looking for something.

  A.even though

  B.even if

  C.only if

  D.as if

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• 3The world is full of wonders, _____ we open our eyes to see them．

  A.if only

  B.as if

  C.even if

  D.only if

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• 4—What do you think of the music teacher ? —______ she is an attractive lady, she can be extremely difficult to work with．

  A.If

  B.As

  C.Because

  D.While

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• 5Don't start reading a book _____ you find that it's one you can read with ease and understanding.

  A.when

  B.if

  C.unless

  D.Though

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• 6—Why are you staring at me? —You look stupid! The way you wear is ______ annoys me most.

  A.what

  B.where

  C.how

  D.which

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• 7Schools in the east tend to be better equipped, ____ those in the west are relatively poor.

  A.As

  B.While

  C.When

  D.But

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• 8We don't doubt _______ we will complete all the projects before the year 2010.

  A.when

  B.if

  C.that

  D.whether

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• 9“The impact will only grow _______ Iran's leaders decide to change course and meet their international obligations,” US Secretary of State Clinton warned．

  A.in case that

  B.provided that

  C.unless

  D.until

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• 10______ everyone else wouldn't go to the mountain area, he went without a second thought.

  A.As long as　　

  B.While

  C.Where　

  D.In spite of

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