Many environmentalists think that carbon dioxide is _______ for the global warming, which affects billions and billions of species across the globe.

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• 1The wreckage of something like a jet plain discovered in the heart of the desert is believed ______ a UFO and _______down for reasons still mysterious.      

  A.to be; have fallen

  B.to have been; to have fallen

  C.to be; to fall

  D.having been; having fallen

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• 2____ the project as planned, we'll have to work two more hours a day.

  A.Completing

  B.Complete

  C.Completed

  D.To complete

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• 3Jimmy needs to improve his technique if he _____ gold at 2012 Olympic.

  A.wins

  B.is winning

  C.will win

  D.is to win

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• 4____ late in the afternoon, Bob turned off the alarm.

  A.To sleep

  B.Sleeping

  C.Sleep

  D.Having sleep

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• 5_______the safety of gas, the government has checked the city's gas supply system thoroughly.

  A.To ensure

  B.Ensuring

  C.Having ensure

  D.D.To have ensured

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• 6You can go and play games with your friends when you finish your homework. But remember ______ all the lights when you leave.   

  A.to switch off

  B.to switch on

  C.switching off

  D.switching on

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• 7Which do you prefer ______ your weekends,playing computer games or watching TV?

  A.spending

  B.to spend

  C.being spent

  D.spend

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• 8I've worked with children before, so I know what_____ in my new job.

  A.expected

  B.to expect

  C.to be expecting

  D.expects

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• 9-Why is the girl crying so sadly？      -She is forbidden_________ in ______ her sick mother.       

  A.dropping ; on

  B.to drop ; on

  C.dropping ; at

  D.to drop; to

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• 10To some extent, uncontrolled information from the website that many people turn _______ false.

  A.to prove

  B.to proves

  C.prove

  D.proves

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