Modern science has given clear evidence ______ smoking can lead to many diseases

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• 1Jack is ______ go to school,so his mother has to stay at home to look after him.

  A.young enough to

  B.old enough to

  C.too young to

  D.very old to

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• 2Only by imagining and creating ________ a difference

  A.can make

  B.you can make

  C.make

  D.can you make

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• 3Some scientists believe that it won't be long _______ robots are widely used in all walks of life．

  A.since

  B.after

  C.before

  D.until

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• 4________ some doubt among scientists about the cause of cancer.

  A.It exists

  B.There exists

  C.There is existing

  D.It is existing

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• 5I don't know the restaurant，but it is ____ to be quite a good one.

  A.said

  B.told

  C.spoken

  D.talked

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• 6 ________should be paid to our study,and only in this way ________make progress.

  A.Heart;we can

  B.Mind;can we

  C.Attention;can we

  D.Notice;we can

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• 7After the exam, my teacher told me that failure ________ the mother of success.

  A.was

  B.is

  C.be

  D.been

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• 8______ label to each of the trees, with detailed introduction of their features, and visitors will know more about them and how to protect them.

  A.To attach

  B.Attach

  C.Attached

  D.Having attached

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• 9Europeans made ______ clear that they did not want to take the Romans as neighbors.

  A.so

  B.very

  C.it

  D.that

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• 10For a moment nothing happened. Then ________ all shouting together.

  A.voices had come

  B.came voices

  C.voices would come

  D.did voices come

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