He was so careless that he left _________the door _________.

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• 1Martin Cooper , a US researcher , was considered _______ the first cell phone .

  A.invented

  B.to invent

  C.having invented

  D.to have invented

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• 2It is really a challenge for me to finish it. In order not to be disturbed, I spent three days ______ in my study surfing the internet to do the research.

  A.locking

  B.locked

  C.to lock

  D.lock

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• 3He was barking ____ let him in.

  A.for someone to

  B.in case of someone

  C.so someone to

  D.so that someone

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• 4If you want to visit the museum, I recommend _________ there by underground.

  A.you to go

  B.going

  C.you went

  D.to going

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• 5Have you realized the difficulty we have _______ the problem?

  A.worked out

  B.to work out

  C.work out

  D.working out

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• 6The teacher called Tom to his office because he was caught_____in the exam.

  A.to cheat

  B.cheating

  C.cheated

  D.cheat

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• 7She wanted to be independent of her parents. She tried ____ alone, but she didn't like it and moved back home.

  A.living

  B.to live

  C.to be living

  D.having lived

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• 8You never imagine what trouble I have had ______ your house．It took me nearly 2 hours．

  A.to find

  B.finding

  C.found

  D.for finding

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• 9She couldn't help, even though she tried not to, ____ at the strange clothes her friend was wearing.

  A.to laugh

  B.laugh

  C.laughing

  D.laughed

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• 10The child complained that the old man made no answer when ______ where he lived．

  A.asking

  B.being asked

  C.having asked

  D.asked

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