________ these experiments were successfully completed would we think of going into humans.

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• 1 Not until he went through real hardship ________ the love we have for our families is important.　　　　　　　　　　　　　　　　　　

  A.had he realized

  B.did he realize

  C.he realized

  D.he had realized

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• 2Not until he failed the exam _______he had left his books untouched .

  A.did he realize

  B.had he realized

  C.he realized

  D.he had realized

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• 3— She suggested the number of cars should be limited to stop air pollution. —_______, the idea is not very practical.

  A.Sounds good as it

  B.As it sounds good

  C.As good it sounds

  D.Good as it sounds

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• 4 _________him not to do so, he wouldn't have made such a serious mistake.

  A.Did I persuade

  B.If I persuade

  C.If I should persuade

  D.Had I persuaded

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• 5The driver wanted to park his car near the roadside but was asked by the police ______.

  A.not to do

  B.not do

  C.not to

  D.do not

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• 6----What's Joan doing? ----_________newspapers in the room.

  A.She reading

  B.She reads

  C.To read

  D.Reading

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• 7Never before______ such a wonderful park, ______ I'd like to pay a visit again.

  A.had I seen; where

  B.have I seen; which

  C.have I seen; where

  D.had I seen; which

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• 8－Look，here________． －Oh，it's my secretary.But I________him to pick me up at seven o'clock.

  A.comes a car；had told

  B.comes a car；told

  C.does a car come；had told

  D.a car comes；told

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• 9________ about this computer program, a huge amount of time and energy 　　　　.

  A.Should I know; be saved

  B.If I had known; can be saved

  C.Had I known; would have been saved

  D.Did I know; was saved

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• 10__________ the style of the singer, but they also followed him everywhere.

  A.Not only the fans copied

  B.Not only did the fans copy

  C.Not only copied the fans

  D.Not only the fans did copy

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