The emergency center is in great need of O-type blood，but there is__________ at hand.

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• 1—Do you know why Jane was so angry? —Her roommate gave in to ________ and opened the letter addressed to her.

  A.curiosity

  B.consideration

  C.concern

  D.convenience

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• 2A wellwritten composition ________ good choice of words and clear organization.

  A.calls on

  B.calls for

  C.calls up

  D.calls off

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• 3Yesterday, I came across my former classmate, but his name ________ me, which made me embarrassed.

  A.forgot

  B.missed

  C.escaped

  D.reminded

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• 4The managing director took the ________ for the accident, although it wasn't really his fault.

  A.charge

  B.account

  C.blame

  D.cause

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• 5The gas in my car is ______. I must find a gas station to fill it up as soon as possible.

  A.trying out

  B.letting out

  C.running out

  D.breaking out

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• 6The speed limit for bicycles on campus is 15 mph, ___________ otherwise posted.

  A.unless

  B.until

  C.since

  D.however

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• 7Jumping out of ______ airplane at a height of 5000 kilometers is ___ unforgettable experience.            

  A.an ; a

  B.an ; an

  C.an ; /

  D.a ; an

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