Polar bears live mostly on___________sea ice,which they use as_________ platform for hunting seals.   

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• 1It is   such  ____  mistake    to   take   part   in  ____ celebration.

  A.an; /

  B.the; the

  C.an; the

  D./; the

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• 2My mother's birthday is on ________ Friday this year.

  A.不填

  B.a

  C.an

  D.the

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• 3— It is reported that there is ________ big breakthrough in the cancer treatment.   — If only his son could be brought back to ________ life!     

  A.a ; 不填

  B.不填 ; a

  C.the ; the

  D.a ; the

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• 4It is generally accepted that ________ boy must learn to stand up and fight like ________man.

  A.a; a

  B.a; the

  C.the; the

  D.a; /

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• 5It's ____ wise choice to use a four wheel drive car on ____ snowy day.

  A.a; a

  B.the; /

  C./; a

  D.the; the

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• 6In the rush hour, hiring ________ taxi for you to do what you are eager to do may be ________ betterchoice in our city.     

  A.the; the

  B.a; the

  C.a; a

  D./; a

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• 7____ accident happened at _______ not far from the Communication Bank.    

  A.An; a crossroads

  B.The; crossroads

  C.A; the crossroads

  D.X; a crossroads

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• 8_____ development of nuclear weapon is _____ threat to _____ mankind.

  A.The ; / ; the

  B.The; a; /

  C.A; / ; the

  D.A; a; /

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• 9There was  _____ time _____ I hated to go to school.

  A.a; that

  B.a; when

  C.the; that

  D.the ; when

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• 10My neighbor asked me to go for _____ walk, but I don't think I've got _____ energy.

  A.a; 不填

  B.the; the

  C.不填; the

  D.a; the

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