Nuclear radiation is said ________ the biggest health challenge in Japanese Earthquake Over the past few months．

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• 1Miss Alice can’t help ________ the house because she is busy making a cake in the kitchen．

  A.to clean

  B.cleaning

  C.cleaned

  D.be cleaned

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• 2A suspected man was observed ________ the bank and then he went out of it．

  A.enter

  B.entered

  C.to enter

  D.entering

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• 3If I had remembered ________ the door, the things would not have been stolen．

  A.to lock

  B.locking

  C.to have locked

  D.having locked

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• 4Liu Ming is said ________ abroad for one year before he came to teach in our school．

  A.to have studied

  B.to study

  C.to be studying

  D.to have been studying

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• 5The three nations were wise enough not ________ the agreement until they could discuss it further．

  A.to sign

  B.signing

  C.having signed

  D.to have signed

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• 6The ancient Egyptians are supposed _________ rockets to the moon．

  A.to send

  B.to be sending

  C.to have sent

  D.to have been sending

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• 7Once he has determined ________ something, no one can change his mind．

  A.to do

  B.doing

  C.to have done

  D.having done

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• 8We ran there as quickly as we could, ________ the plane had taken off．

  A.found

  B.finding

  C.only to find

  D.only finding

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• 9Astronauts can be affected by loneliness for they have to sit in the spacecraft for weeks with very little ________ and no one ________．

  A.to do; to talk

  B.doing; to talk to

  C.to do; to talk to

  D.doing; to talk

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• 10Schools across China are expected to hire 50,000 college graduates this year as short-term teachers ________ increase job opportunities．

  A.help

  B.to have helped

  C.to help

  D.having helped

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