Vitamin D helps our bodies make a special chemical, and this special chemical, ______, affects our brains, making us feel happy.

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• 1It is illegal for a public official to ask people for gifts or money________favors to them.

  A.in preference to

  B.in place of

  C.in agreement with

  D.in exchange for

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• 2If a person has not had enough sleep,his actions will give him _______ during the day.

  A.out

  B.up

  C.in

  D.away

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• 3The old man put on his glasses ________ see better.

  A.on purpose

  B.in order that

  C.so as

  D.in order to

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• 4American women usually identify their best friends as   someone____they can talk frequently.    

  A.who

  B.as

  C.about which

  D.with whom

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• 5Is this the school ________ you studied ten years ago?

  A.in which

  B.that

  C.in that

  D.the one that

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• 6-You aren't angry at his disgraceful joke?-No. ________it, I've never laughed so much in my life.

  A.More than

  B.Apart from

  C.Instead of

  D.Far from

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• 7She devotes herself _________ , and makes it her life.    

  A.to teach

  B.to teaching

  C.teach

  D.teaching

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• 8_______sending emails, I've kept in touch with my American friend for many years.

  A.In exchange for

  B.On behalf of

  C.In return for

  D.By means of

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• 9There are altogether eleven books on the shelf,_______ five are mine.     

  A.on which

  B.in which

  C.of which

  D.from which

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• 10In order to stop his wife from attending the party, he took away the key to their car _____.

  A.by mistake

  B.in surprise

  C.on purpose

  D.by chance

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