Just like fingerprints, each person's DNA is ________unless he has a twin.

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• 1I don't think she is a nice woman；I'm ______ her empty talk.

  A.grateful for

  B.tired of

  C.crazy about

  D.concerned about

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• 2House prices keep rising these days. A flat in our city costs ____ now as in 1990.

  A.as three times much

  B.as much three times

  C.much as three times

  D.three times as much

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• 3Living in the city will surely put you in touch with people from ______ cultures．

  A.abundant

  B.diverse

  C.tough

  D.constant

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• 4Since the new director took office, we have worked ______hours, －that is to say, we work more freely.

  A.flexible

  B.compulsory

  C.strict

  D.endless

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• 5Though he was born and brought up in Australia, he can speak ______ Chinese.

  A.fluent

  B.smooth

  C.flowing

  D.floating

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• 6It is _____ that the middle-aged lady will pass the driving test.

  A.certain

  B.confident

  C.brief

  D.sure

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• 7It is ____ asking Tom for help, for he is always the last to help others.

  A.useful

  B.helpless

  C.helpful

  D.useless

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• 8Taking exercises is _______to your health.

  A.benefit

  B.beneficial

  C.benefits

  D.benefits

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• 9Today, _______ people speak English as their first, second or a foreign language than ever before.

  A.many

  B.some

  C.more

  D.most

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• 10Jane was hit on the head by the robber and was knocked ________.

  A.mindless

  B.unaware　　　　

  C.brainless　　　

  D.unconscious

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