After climbing up to the top of the mountain, all of us _______.


  1. A.
    were tiring
  2. B.
    are tired
  3. C.
    were tired out
  4. D.
    were tiring out

There aren’t many seats left for this concert; you’d better come _______ to _______ that you have one today.


  1. A.
    enough early; make sure
  2. B.
    enough early; be sure of
  3. C.
    early enough; be sure of
  4. D.
    early enough; make sure

Can you imagine a boy of six _______ that kind of difficult problem?


  1. A.
    work out
  2. B.
    working out
  3. C.
    to work out
  4. D.
    to have worked out

It’s natural that parents _______ the growth of their children.


  1. A.
    are concerning about
  2. B.
    are concerned about
  3. C.
    concern about
  4. D.
    concerned about

Most of the artists ________ to the conference were from Europe and Asia.


  1. A.
    invited
  2. B.
    to invite
  3. C.
    being invited
  4. D.
    had been invited

The teacher became cross because many of the students ________ to finish their homework.


  1. A.
    tried
  2. B.
    managed
  3. C.
    failed
  4. D.
    had

How I regret the hours ________ in the woods and the fields, ________ I should have studied.


  1. A.
    wasting; where
  2. B.
    wasted; where
  3. C.
    wasting; when
  4. D.
    wasted; when

When trees are cut down, there is nothing to ________ the soil in ________ on the hillside.


  1. A.
    keep; the place
  2. B.
    keep; places
  3. C.
    hold; place
  4. D.
    hold; the places

The main reason for animals ________ is that the places where they used to live have been destroyed．


  1. A.
    die out
  2. B.
    died out
  3. C.
    dying out
  4. D.
    to die out

When we say a person is famous， we mean he or she is ________．


  1. A.
    well-know
  2. B.
    well-knew
  3. C.
    well-known
  4. D.
    well-knowing
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