No one has yet succeeded in explaining the ________ of how life began.

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• 1When you go out for a picnic, you must ________ snakes in the bushes.

  A.be careful

  B.look out

  C.watch out for

  D.take care of

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• 2She told me that she ________ by swimming and playing tennis.

  A.remained health

  B.kept fit

  C.in good health

  D.was in good health

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• 3At last, the student realized that he must ________ some study.

  A.begin to

  B.go to

  C.get down to

  D.sit down to

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• 4I trusted him but he _____.

  A.put me down

  B.dropped me down

  C.drove me down

  D.let me down

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• 5After Mrs Zhang came in, she asked the monitor to ________ the papers around the class.

  A.give in

  B.give out

  C.give up

  D.give away

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• 6At first, everyone listened attentively, but ______ some people became restless and a couple of them began to leave．

  A.in the end

  B.by the end

  C.at the end

  D.towards the end

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• 7I ________ his gift, but I didn't ________ it.

  A.accept; receive

  B.receive; accept

  C.receive; receive

  D.accept; accept

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• 8Knock at the door ________ and perhaps you will get an answer.

  A.once

  B.once more

  C.at once more

  D.more once

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• 9Work hard and you will succeed ________.

  A.in time

  B.on time

  C.in no time

  D.at no time

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• 10Something that is_______ can be moved easily from place to place.

  A.mobile

  B.moving

  C.alive

  D.lively

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