It is well known that ______ dolphin is _______ intelligent animal.   

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• 1We should have _____ sense of responsibility to do something to help _____ poor whenever they are in_____ trouble.

  A.a; 不填; the

  B.a; the ;不填

  C.不填; the; the

  D.a; the; the

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• 2The origin of ____ life on earth is ____ question that interests astronomers.

  A.the; the

  B.; a

  C.; the

  D.the; a

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• 3I ate _____ sandwich while I was waiting for _____ 20:08 train.

  A.the, a

  B.the, the

  C.a, the

  D.a, a

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• 4Jumping out of _____ airplane at ten thousand feet is quite _____ exciting experience.

  A.不填; the

  B.不填; an

  C.an; an

  D.the; the

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• 5Word came that my best friend Tom was accepted by ___ Oxford University, and I planned to goto ____ cinema with him for ____ celebration.

  A./; the; a

  B.the; /; a

  C.the; /; the

  D.the; the; the

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