There's no way of knowing why one man makes an important discovery ______ another man, also intelligent, fails.

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• 1—We________gas.I'm afraid we can't go much further. —I know there's a gas station ahead.Sure it will last us until we get there.

  A.are running out　

  B.have run out

  C.are running out of

  D.have run out of

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• 2---Excuse me, has the train from Beijing arrived yet? --- ________, you are three quarters earlier. It's only 9 now.

  A.Unconsciously

  B.Instantly

  C.Absolutely

  D.Actually

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• 3She reached the top of the hill and stopped ____ on a big rock by the side of the path.

  A.to have rested

  B.resting

  C.to rest

  D.rest

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• 4---I am taking my driving test tomorrow! ---__________!

  A.Cheers

  B.Good luck

  C.Come on

  D.congratulations

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• 5With the word 'PM2.5'______ heard and seen in our life, people become more and more concerned about air pollution.

  A.constantly

  B.occasionally

  C.consequently

  D.contemporarily

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• 6Whoever is never ______ with the progress he has made will be a success.

  A.content

  B.proud

  C.abundant

  D.familiar

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• 7—Peter, this is Laura, a student from No. 2 Middle School. —How do you do? I'm very delighted to make your _______.

  A.identification

  B.acquaintance

  C.register

  D.currency

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• 8No matter what happens, you should keep _______. Just look on the bright side of things.

  A.generous

  B.optimistic

  C.careful

  D.practical

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• 9Preparing the final test paper _______ his whole afternoon.

  A.takes up

  B.takes off

  C.takes on

  D.takes over

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• 10— The deadline is drawing, but I failed to challenge the task a third time. — ______ my brother have a try?

  A.Will

  B.May

  C.Shall

  D.Must

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