It is difficult for us to explain phenomena of which we have little or _____ direct knowledge.

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• 1The play is said to be worth seeing.You must have seen it yesterday evening, _____ you、

  A.didn't

  B.mustn't

  C.did

  D.can't

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• 2A light with no more power than _____ by an ordinary electrict light bulb becomes intensely strong as it is concentrated to a pinpointsized beam.

  A.as is produced

  B.that produced

  C.which is produced

  D.produced

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• 3If ever again _____ happens an accident like this,we will have only ourselves to blame．

  A.it

  B.so

  C.there

  D.that

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• 4A certain scientist had discovered that a metal called uranium gave off a kind of radiations,which Madame Curie was later _____ radioactivity.

  A.calling

  B.called

  C.to call

  D.to be called

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• 5Finally they set off again and cycled slowly along the road.“We are not as good at this as we _____ ”,complained Mary.

  A.should be

  B.would be

  C.will be

  D.have been

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• 6They explained the situation to the steward,who brought over some water.He told them that he _____ on the route for twentyfive years.

  A.works

  B.worked

  C.has been working

  D.had been working

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• 7Many ways have been found _____ small and simple machine to process large and complicated machine parts.

  A.by using

  B.to use

  C.using

  D.used

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• 8Some people may have been daunted by the task because of the difficulties it brings,but I do not know of _____ .

  A.them doing so

  B.any having done so

  C.their doing like that

  D.any doing that way

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