Last summer I took a course on _______ poisonous gases.

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• 1This machine is very easy ______. Anyone can learn to use it in a few minutes.

  A.operating

  B.to be operating

  C.operated

  D.to operate

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• 2Only after staying in England for a few weeks did Li Lei become used _______ Chinese.

  A.to not speaking

  B.not to speaking

  C.to not speak

  D.not to speak

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• 3______seems to be no possibility that the student majoring in liberal-arts can win the first prize in the100-meter race.

  A.What

  B.Whether

  C.That

  D.There

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• 4To enjoy the scenery, Irene would rather spend long hours on the train _____ travel by air.

  A.as

  B.than

  C.to

  D.while

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• 5I __________get on the bus when I heard someone calling me from behind.

  A.was to

  B.was going to

  C.would

  D.was about to

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• 6Mary's house in Shanghai cost much more than ours in our hometown, though not half______.

  A.much bigger

  B.as bigger

  C.very big

  D.so big

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• 7Science and technology are developing ______ quickly that some new electronic products are out-of-date within several months.

  A.very

  B.so

  C.such

  D.too

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• 8How long do you think it will be _______ scientists succeed in providing a cure for cancer?

  A.when

  B.after

  C.since

  D.before

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• 9Ten years ago the population of our village was ______ that of theirs.

  A.as twice large as

  B.twice as large as

  C.twice as much as

  D.as twice much as

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• 10If he takes on this work, he will have no choice but ______ an even greater challenge.＿

  A.meets

  B.meeting

  C.meet

  D.to meet

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