No one has yet succeeded in solving the _____ of how life first began.

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• 1To our ______, the result of the experiment is much better than we expected.

  A.regrets

  B.relief

  C.disappointment

  D.sorrow

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• 2They received a number of _____ from customers about the lack of parking facilities.

  A.complains

  B.complaints

  C.complainer

  D.complainers

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• 3Last summer I had ______ in the south of France .

  A.amusing experience

  B.a amusing experience

  C.an amused experience

  D.an amusing experience

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• 4--- Have you seen ______ workers pass by? --- Yes, I've seen ____ them.

  A.woman; hundreds of

  B.women; hundreds of

  C.woman; two hundred of

  D.women; hundred of

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• 5Tell me, Mr. Mentakis, was Mrs. Smith one of your_______ customers?

  A.regular

  B.common

  C.average

  D.usual

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• 6There is no _________ that the Great Wall of China is one of the biggest man-made projects on the earth.

  A.time

  B.doubt

  C.matter

  D.mind

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• 7There was no_________ about it that they had got the news.

  A.affair

  B.doubt

  C.matter

  D.problem

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