But for friction (摩擦力), people ______ neither walk, nor even stand up.

试卷相关题目

• 1Tom ____ have kept his word. I wonder why he changed his mind.

  A.must

  B.should

  C.need

  D.would

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• 2If my father ______ here yesterday, he would have stopped me from going surfing.

  A.had been

  B.were

  C.should be

  D.has been

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• 3He commanded that all the gates _____when it was getting dark in case thieves came in .    

  A.were shut

  B.must be shut

  C.could be shut

  D.be shut

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• 4I _____ sooner but I didn't know that they were waiting for me .

  A.had come

  B.was coming

  C.would come

  D.would have come

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• 5She had to work deep into the night, ______she couldn't have spread the messages to all the relevant people successfully.

  A.while

  B.but

  C.otherwise

  D.so

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• 6The workers demanded that their employer_____ their working conditions.  

  A.had improved

  B.would improve

  C.improve

  D.will improve

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• 7He commanded that all the gates ________．

  A.should shut

  B.would be shut

  C.shut

  D.be shut

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• 8I'd rather you _______that now, than afterwards.

  A.know

  B.to know

  C.knowing

  D.knew

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• 9The children in the orphanage requested they ______on a tour across the city.

  A.take

  B.took

  C.be taken

  D.were taken

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• 10--Did Jane come to help you yesterday? --Yes, but I would rather _________. She caused me a lot of trouble.

  A.not have

  B.not

  C.she didn't

  D.she hadn't

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