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

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• 1I ____ 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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• 2The 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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• 3One more week,______ we will leave school and have a holiday.

  A.so

  B.but

  C.and

  D.or

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• 4—Have you got used to the country life there? —Yes，but I don't like ________ when it comes to shopping and amusement.

  A.that

  B.this

  C.so

  D.it

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• 5Scientists 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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• 6Please 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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• 7He made another wonderful discovery, ______ of great importance to science.

  A.which I think it is

  B.which I think is

  C.which I think

  D.I think which is

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• 8How 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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• 9It 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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