He made another wonderful discovery, ______ of great importance to science.

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• 1Please do me a favor----_____ my friend Mr. Smith to Youth Theater at 7:30 tonight.

  A.to invite

  B.inviting

  C.invite

  D.invited

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• 2Scientists say it may be five or six years _______ it is possible to test this medicine on human patients.

  A.since

  B.after

  C.before

  D.when

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• 3Scientists say it may be five or six years ______  it is possible to test this medicine on human patients.

  A.before

  B.after

  C.since

  D.when

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• 4I ____ at my new novel when the big earthquake happened at 2:20 pm.

  A.am working

  B.was working

  C.have worked

  D.had been working

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• 5The big fire in Shanghai, believed to ______ due to the burning of construction materials, caused 58 deaths and destroyed all the belongings of the people there.

  A.have occurred

  B.occur

  C.have been occurring

  D.be occurring

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• 6How long do you think ______ the computer company brings out a new product?

  A.it will be before

  B.will it be until

  C.will it be when

  D.it will be that

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• 7It is obvious that people hold different opinions about _______ voluntary services should be financially rewarded.

  A.that

  B.what

  C.how

  D.whether

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• 8---He seems to be a teacher. ---______. He has been a teacher for 20 years.

  A.So he does

  B.So he is

  C.So does he

  D.So is he

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• 9Most of the young girls know they should cut down on fat, but knowing such a thing isn't of much help when it ______ shopping and eating.

  A.refers to

  B.comes to

  C.speaks of

  D.focuses on

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• 10We all thinks that Jack ____________ for his son's bad performance at school.

  A.is to blame

  B.is to be blame

  C.are to be blamed

  D.are be blame

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