With the greatest difficulty, they ________ swim to the other side of the river.


  1. A.
    can
  2. B.
    could
  3. C.
    were able to
  4. D.
    could be able to

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


  1. A.
    to be satisfied
  2. B.
    to satisfy
  3. C.
    satisfied
  4. D.
    being satisfied

Scientists have created ________ antelligent food wrapping material that changes color if ________ acontents are going bad．


  1. A.
    an; 不填
  2. B.
    不填; the
  3. C.
    an; the
  4. D.
    the; 不填

Let Mary play with your toys as well, Tina, you must learn to ________．


  1. A.
    spare
  2. B.
    take
  3. C.
    support
  4. D.
    share

Looking round the town, he felt as though he ________ away for ages.


  1. A.
    has been
  2. B.
    was
  3. C.
    is
  4. D.
    had been

We should protect the trees from ____________.


  1. A.
    destroy
  2. B.
    destroying
  3. C.
    being destroyed
  4. D.
    be destroyed

The workers ________ that the company make an apology to the girl publicly for what they had done to her．


  1. A.
    asked
  2. B.
    demanded
  3. C.
    said
  4. D.
    promised

It was in the classroom ________ I found his key ________ the door.


  1. A.
    where, to
  2. B.
    that, to
  3. C.
    where, at
  4. D.
    which, at

The smoke from the fire was ________ thick for them ________ on the roof .


  1. A.
    so, can't land
  2. B.
    such, not to land
  3. C.
    too, cannot land
  4. D.
    too, to land

By the middle of this century, the majority of the world’s population ________ in cities．


  1. A.
    will be living
  2. B.
    are living
  3. C.
    have lived
  4. D.
    will have lived
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