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

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• 1To their surprise, they found the lecture given by the famous professor easy ______.    

  A.to be understood

  B.to understand

  C.understanding

  D.understood

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• 2He forbids his children ____________ sweets because they do harm to their teeth.

  A.eating

  B.not eating

  C.to eat

  D.not to eat

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• 3She couldn't wait ________ home after such a long and tiring journey.

  A.going

  B.to go

  C.go

  D.went

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• 4I went to see him, _____ him out.

  A.finding

  B.find

  C.only to find

  D.to finding

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• 5They set out _______ for the _______boy.   

  A.searching, losing

  B.searching, lost

  C.to search, lost

  D.searching, losing

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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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• 7Many environmentalists think that carbon dioxide is _______ for the global warming, which affects billions and billions of species across the globe.

  A.blamed

  B.to be blamed

  C.to blame

  D.blaming

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• 8Four years later,she became the first woman____a degree in agriculture from that famous school.    

  A.receive

  B.receiving

  C.received

  D.to receive

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• 9Which 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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• 10My job is feeding the cat. Now it's your turn ______ the dog.

  A.feeding

  B.to feed

  C.to have fed

  D.being fed

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