I don't know who invented _____digital camera, and it's really _____ most useful invention.

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• 1The story shows that _______ knowledge of _______ first aid can make ______ real difference.

  A.the; the; /

  B.a; /; a

  C./; the; a

  D.a; /; /

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• 2“ 2012”, ________ disaster film directed by Roland Emmerich, is so attractive that I want to see it ________ second time.

  A.the; the

  B.a; a

  C.a; the

  D.不填; a

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• 3________ Mayan（玛雅）Calendar marks the end of the earth around December 22, 2012, which has caused ________ great panic among people.

  A.The; a

  B.A; the

  C.不填; 不填

  D.不填; a

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• 4He missed ______ gold in the high jump, but will get _____ second chance in the long jump.

  A.the; the

  B./; a

  C.the; a

  D.a; /

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• 5_________ development of nuclear weapons is _________ threat to mankind.

  A.The; a

  B.The; the

  C.A; a

  D.A; the

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• 6Experts think that _______ recently discovered painting may be _____Picasso.

  A.the;/

  B.a; the

  C.a; /

  D.the; a

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• 7.Although it had been______ struggle for him to finish the experiment, he enjoyed the result with________ satisfaction.

  A.the, /

  B.a, /

  C.a, a

  D./, a

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• 8Jumping 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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• 9Instead of sending _______ e-mail, Nancy talks with her mother on _______ mobile phone once a week.

  A.the; a

  B.an; the

  C.an; /

  D.the; an

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• 10The party was ____ success. We sang and danced until it came to ____ end at midnight.

  A.a; an

  B.a; the

  C.the; an

  D./; an

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