We laugh at jokes，but seldom _________ about how they work．

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• 1______, he still cannot make himself understood.

  A.So clearly he speaks English

  B.So clearly does he speak English

  C.Clearly as he speaks English

  D.As he speaks English clearly

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• 2Never _____ forget the days when _____ together with you.

  A.shall I...I lived

  B.shall I...did I live

  C.I shall...I lived

  D.I shall...did I live

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• 3Not until some students failed in the exam _____ how much time they had wasted.

  A.didn't they realize

  B.did they realize

  C.they didn't realize

  D.they realize

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• 4 ______ the beginning of the 19th century did scientists know that all matter is made up of atoms.

  A.At

  B.By

  C.Up to

  D.Not until

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• 5They believed, and _______ did we, that these modern paintings collected in the Shanghai Art Gallery were as valuable as those in the Museum.

  A.that

  B.which

  C.neither

  D.so

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• 6  -- ________. --- Yes. Two minutes earlier, we could have caught the bus.

  A.Miss

  B.Missed it

  C.Missing it

  D.Having missed it

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• 7 --- I didn't enjoy the play given by those young people. --- ______.

  A.Me, either

  B.Me, too

  C.I, either

  D.I, too

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• 8—Shall I invite Tom to my party? —Yes,it will be nice if you ________.

  A.do

  B.do invite

  C.are

  D.invited

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• 9If _________, the bird flu would produce a powerful poison that would kill the patients.

  A.not treat

  B.not treated

  C.untreated

  D.Both B and C

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• 10John opened the door . There _________ he had never seen before.   

  A.a girl did stand

  B.a girl stood

  C.did a girl stand

  D.stood a girl

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