He was busy writing a story, only _______ once in a while to smoke a cigarette.

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• 1I regret ______ you that you will miss your flight if you don't hurry up. You have only twenty minutes to go.

  A.to tell

  B.telling

  C.having told

  D.to telling

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• 2I don't think math ________.          

  A.easily to be learned

  B.easily to learn

  C.easy to be learning

  D.easy to learn

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• 3I'm sorry that I can't help _____ trees because I am busy with the homework.

  A.to plant

  B.planting

  C.planted

  D.plants

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• 4_______ to wait a long time at the dentist's, Mike decided to take along a magazine to read.

  A.Expected

  B.Not expected

  C.Expecting

  D.Not expecting

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• 5Samuel Clemens, _____ Mark Twain, because a famous American writer.

  A.was known as

  B.known as

  C.was known for

  D.known for

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• 6He received a telegram ________ “Mother Sick.”

  A.written

  B.said

  C.reading

  D.writing

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• 7—What do you think of the book? —Oh, excellent．It's worth ________ a second time．  

  A.to read

  B.to be read

  C.reading

  D.being read

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• 8A powerful earthquake, _______ a magnitude of 6.3, struck the Indonesian island of Sumatra today, and ________ at least 70 people.

  A.measured; killing

  B.to measure; killed

  C.measuring; killed

  D.measuring; having killed

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• 9The teacher spoke loudly in class so as to make herself ______clearly.

  A.hear

  B.to be heard

  C.heard

  D.to hear

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• 10It remains ______ whether Liu Xiang will take part in the next Olympics.

  A.to see

  B.to be seen

  C.seeing

  D.to have seen

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