A few years ago, scientists in the Antarctic became aware of ________ in the ozone layer.

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• 1—The mobile phone is out of date.—Why not try __________ Iphone 4.

  A.to use

  B.to be using

  C.using

  D.being used

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• 2I'm looking forward ________ a trip to Mount Tai.

  A.to take

  B.to taking

  C.at taking

  D.on taking

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• 3Her little son fell off the boat into the water due to her carelessness. The mother couldn't help _____because she couldn't help _____ her son out of the danger.   

  A.crying; to save

  B.crying; saving

  C.to cry; to save

  D.cry; saving

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• 4You can hardly imagine the trouble we had _______ in touch with him again?

  A.getting

  B.keeping

  C.to get

  D.kept

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• 5-They are quiet, aren't they?   -Yes. They are accustomed ___________at meals.   

  A.to talk

  B.to not talk

  C.to talking

  D.to not talking

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• 6The old man used _____ in front of his house and he has got used to _______ like that.   

  A.to sit; doing

  B.to sitting; do

  C.to sit; do

  D.to sitting; doing

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• 7Accustomed to ________ the steep mountains,he had no difficulty reaching the top.

  A.climbing

  B.climb

  C.having climbed

  D.have climbed

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• 8She has been practising _______ the same tune on the piano for nearly an hour.

  A.play

  B.playing

  C.to play

  D.be playing

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• 9Not knowing his address , she had some difficulty ________ his house.

  A.finding

  B.to find

  C.found

  D.find

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• 10You can't imagine what difficulty we had ________ home in the snowstorm.  

  A.walked

  B.walk

  C.to walk

  D.walking

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