No matter what substance it may be, it is ________ atom.  

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• 1---- What were you doing when Tony phoned you? ---- I had just finished my work and _____to take a shower.

  A.had started

  B.started

  C.have started

  D.was starting

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• 2Seeing a large crowd at the street corner，I became aware of ______ unusual happening．

  A.anything

  B.something

  C.everything

  D.nothing

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• 3— Isn't it hard to drive downtown to work? — Yes, that's why I ______ to work by train

  A.have been going

  B.was going

  C.have gone

  D.will have gone

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• 4Only when they came ___________.

  A.I left the office

  B.did I leave the office

  C.left I the office

  D.I did leave the office

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• 5It was because he was ill ______ we decided to return home.

  A.why

  B.that

  C.when

  D.where

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• 6If we _________ the earth, we must take action before it is too late.

  A.will save

  B.are to save

  C.are about to save

  D.are saving

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• 7Mr Baker is always making _____comments instead of straightforward yes-or-no replies.

  A.ambiguous

  B.unconscious

  C.amateur

  D.punctual

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• 8It was at 5 o'clock __________ the visitors finally arrived at Pudong International Airport.

  A.when

  B.that

  C.before

  D.after

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• 9In the U.S, ______a tip is thought to be polite when paying the bill.

  A.leave

  B.having left

  C.leaving

  D.being left

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• 10Children are excited about the approach of Christmas, _____ may bring great happiness to them.

  A.it

  B.which

  C.what

  D.that

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