So between 1510 and 1514 Copernicus worked on it, gradually _____ his theory until he felt it was complete.

试卷相关题目

• 1The ship rocked violently from side to side, ______ many passengers to feel seasick

  A.causing

  B.caused

  C.which causing

  D.to cause

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• 2There were more than five hundred competitors _____ part in the sports meet last week.

  A.took

  B.taken

  C.taking

  D.take

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• 3When _____ his sister for some money, he couldn't keep feeling ashamed.

  A.asked

  B.was asking

  C.being asked

  D.asking

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• 4There is still a long way to go to solve all the problems ______ conservation of natural resources.

  A.concerning

  B.concerned

  C.concerning about

  D.concerned about

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• 5Of the 9,500 drivers ____ since the beginning of the year, 23% were found ____ in road knowledge.

  A.tested; lacking

  B.testing; lacked

  C.tested; lacked

  D.to test; lacking

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• 6You can't imagine what great trouble I had ____ his address.

  A.to find

  B.of finding

  C.finding

  D.about finding

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• 7Taiyuan, a city in North China, was struck by a heavy snowfall last week, ____ serious traffic problems.

  A.to face

  B.faced

  C.facing

  D.having faced

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• 8The _____ boy was last seen _____ near the East Lake.

  A.missing; playing

  B.missing; play

  C.missed; played

  D.missed; to play

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• 9Scientists have created the world's smallest 'snowman', ____ about a fifth of the width of a human hair.

  A.measuring

  B.measures

  C.measured

  D.to measure

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• 10You can hardly imagine the difficulty the woman had _____ her children.

  A.brought up

  B.to bring up

  C.bringing up

  D.to have brought up

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