The World Health Organization expects a vaccine against H1N1 to be ________ by September or October this year．

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• 1I still feel _________ about the error in the accounts；I ought to have noticed it, and pointed it out．

  A.shameless

  B.regrettable

  C.skeptical

  D.guilty

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• 2Most artists care more for the ________ success of their research than their physical conditions．

  A.cultural

  B.commercial

  C.classical

  D.academic

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• 3Though Jack is very young, he always keeps ________ in face of sudden danger．

  A.Silent

  B.quiet

  C.still

  D.calm

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• 4The teacher asked for _________ facts explaining the fall of the Roman Empire．

  A.outspoken

  B.vague

  C.concrete

  D.supreme

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• 5It was a ________ match, with the w inning goal scored in the final minute．

  A.tight

  B.tough

  C.rough

  D.tense

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