When it ______ research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.

试卷相关题目

• 1While you are reading an article, You’d better _______ the key words and topic sentences.

  A.make out

  B.mark out

  C.carry out

  D.hold out

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• 2It’s nearly 5 years since I worked in the company. I _______ in a school.

  A.taught

  B.was teaching

  C.am teaching

  D.had been teaching

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• 3He ______ an important part in putting out the fire.

  A.played

  B.took

  C.made

  D.had

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• 4—What about the protection? —Let’s keep the surface ______ dirt by putting a cover over it.

  A.far from

  B.free from

  C.apart from

  D.away from

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• 5Each girl present at the party was wearing a flower in the hair, which__________their beauty.

  A.added

  B.added up

  C.added to

  D.added up to

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• 6The boy was so careless that the glass fell from his hand and it ______ on the floor.

  A.broke in

  B.broke down

  C.broke up

  D.broke out

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• 7To keep healthy, Professor Johnson ______ cycling as a regular form of exercise after he retired.

  A.took up

  B.caught on

  C.carried out

  D.made for

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• 8They _______ another song from Jay because he sang so well.

  A.ordered

  B.asked

  C.needed

  D.requested

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• 9You have no idea what I’ve had to ______ during the last few months.

  A.come through

  B.go through

  C.cut through

  D.look through

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• 10Would you slow down a bit, please.  I can’t _____ you

  A.keep up with

  B.put up with

  C.make sure

  D.hold on

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