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

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• 1_______ 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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• 2Samuel 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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• 3The letter Mary had looked forward to ________her last night and she was very excited．

  A.reached

  B.reaching '

  C.had reached

  D.has reached

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• 4“ We can't go out in such bad weather,” said Susan, _______ out of the window.

  A.looked

  B.to look

  C.having looked

  D.looking

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• 5_______ advantages and disadvantages, Mr. Smith decided to leave the company and go to the west to try his fortune.

  A.Having compared

  B.Having balanced

  C.Having observed

  D.Having examined

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• 6I 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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• 7I 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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• 8He was busy writing a story, only _______ once in a while to smoke a cigarette.

  A.to stop

  B.stopping

  C.to have stopped

  D.having stopped

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• 9He received a telegram ________ “Mother Sick.”

  A.written

  B.said

  C.reading

  D.writing

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• 10—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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