Bats are surprisingly long-lived creatures, some ________ a life span of 20 years.

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• 1Mary had to go to a meeting，so she left her children ___________ at home.

  A.playing

  B.played

  C.to play

  D.having played

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• 2Desserts made from apples, such as pies, apple pancakes and apples __________ in sugar are available for sampling.

  A.dipping

  B.dip

  C.dipped

  D.to dip

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• 3The astronauts started their journeys in rockets __________ forward by jets of hot gas.

  A.drove

  B.driven

  C.driving

  D.to drive

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• 4______ many times, my elderly mother still can't remember how to light the gas.

  A.Had told

  B.Having told

  C.Having been told

  D.Being told

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• 5_______ by thick bamboo and high forest, the ancient city hadn't been discovered until the 1990s.

  A.Surrounding

  B.Surround

  C.Surrounded

  D.Having surrounded

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• 6The price system is a complex network _______ the prices of all the products bought and sold in the economy as well as those of a great number of services.

  A.consisting of

  B.consisted of

  C.making up of

  D.made up

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• 7Tony is said ________ to New York, and now he is studying medicine in  a famous college in Americ

  A.A.have gone

  B.to have gone

  C.going

  D.to go

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• 8A hearty laugh relieves physical tension, _____your muscles relaxed for over half an hour.

  A.to leave

  B.left

  C.leaving

  D.leave

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• 9______ the train, they decided to wait for another.

  A.Missed

  B.Missing

  C.Being missed

  D.Having missed

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• 10The next morning he woke up to find himself _________ with a coat.

  A.to be covered

  B.covered

  C.was covered

  D.covering

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