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

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• 1We 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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• 2Once 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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• 3The 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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• 4Nuclear radiation is said ________ the biggest health challenge in Japanese Earthquake Over the past few months．

  A.being

  B.to be

  C.to have been

  D.that it is

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• 5Miss 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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• 6Schools 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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• 7Just as the value of a telephone network increases with each new phone ________ to the system, so does the value of a computer system increase with each program that turns out．

  A.adding

  B.to have added

  C.to add

  D.added

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• 8I decided to quit the job, because I felt my boss hard _________．

  A.to be satisfied

  B.to satisfy

  C.satisfied

  D.being satisfied

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• 9What is new, however, is the scientific attempt ________ whether other planets beyond our own have given birth to advanced civilizations．

  A.discover

  B.discovers

  C.discovering

  D.to discover

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• 10Mr．Caraway is said ________．Who do you know has succeeded him?

  A.to have retired

  B.to be retiring

  C.to retire

  D.having retired

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