_________ in Current Biology, the finding suggests that female birds seek mates with superior singing skills.

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• 1It seems you need to apologize quickly ______ a good friend.

  A.avoiding to lose

  B.to avoid losing

  C.avoiding losing

  D.to avoid to lose

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• 2_______with  his old one, Michael's  new house is like a huge palace

  A.Comparing

  B.Compares

  C.To compare

  D.Compared

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• 3Dina, ______  for months to find a job as a waitress, finally took a position at a local advertising agency.

  A.struggling

  B.struggled

  C.having struggled

  D.to struggle

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• 4The children went home from the grammar school, their lessons ______ for the day.

  A.finishing

  B.finished

  C.had finished

  D.had been finished

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• 5The project alongside with the experiment we had once devoted so much time__________ perfectly.

  A.to work out

  B.to working out

  C.to worked out

  D.has worked out

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• 6--Do you have any trouble _____the work? ---No． in fact we have finished it already．

  A.finishing

  B.to finish

  C.finish

  D.finished

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• 7____ the days he had spent with his American friends, he couldn't help_____.

  A.Keeping up; smile

  B.Staying up; smiling

  C.Looking back on; smiling

  D.Looking at; to smile

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• 8The workers in Australian Air Line had been on strike for two weeks. At last they had their pay _______.

  A.raised

  B.raising

  C.risen

  D.rising

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• 9— Is Bob still performing? — I'm afraid not. He is said ________ the stage as he has become an official.     

  A.to have left

  B.to leave

  C.to have been left

  D.to be leaving

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• 10The teacher came in, ________ by some students.

  A.followed

  B.following

  C.was followed

  D.to follow

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