________from space, our earth, with water covering 70% of its surface, appears as a “blue planet”.


  1. A.
    Seen
  2. B.
    Seeing
  3. C.
    To see
  4. D.
    Having seen

Tom regrets ________harder at school.


  1. A.
    did not work
  2. B.
    having not worked
  3. C.
    not having worked
  4. D.
    not have worked

When a machine of this kind is ________, the materials must be carefully chosen for its parts.


  1. A.
    built
  2. B.
    building
  3. C.
    to build
  4. D.
    to be built

If you go on letting your dog ________after cars, he'll end by ________over.


  1. A.
    to run, running
  2. B.
    running, running
  3. C.
    run, running
  4. D.
    run, being run

It is a good season in which ________in Switzerland.


  1. A.
    travel
  2. B.
    traveling
  3. C.
    to travel
  4. D.
    traveled

We need help badly, so ________ the interview with the applicants as quickly as possible．


  1. A.
    realize
  2. B.
    arrange
  3. C.
    manage
  4. D.
    hold

The brave soldier preferred ________ rather than ________．


  1. A.
    to die;giving in
  2. B.
    to die;to give in
  3. C.
    to lose;losing
  4. D.
    dying;to give in

Three hours later, people ________ from the building on fire．


  1. A.
    tried to escape
  2. B.
    could escape
  3. C.
    managed to escape
  4. D.
    tried escape

She would love to have gone to the party, but she _______ extra hours to prepare for a meeting


  1. A.
    had to work
  2. B.
    had worked
  3. C.
    could work
  4. D.
    would have worked

We plan to reach the North Pole in mid-July, and by then we _______ for six weeks.


  1. A.
    are walking
  2. B.
    have been walking
  3. C.
    will be walking
  4. D.
    will have been walking
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