The best way to prevent the air polluting _____ , but the sky is still not clear.


  1. A.
    is used
  2. B.
    are used
  3. C.
    has been used
  4. D.
    have been used

Color - blind people often find it difficult to ______ between red and green.


  1. A.
    distinguish
  2. B.
    compare
  3. C.
    contrast
  4. D.
    distribute

Facts showed that only when they united ______ the strong enemies.


  1. A.
    could they defeat
  2. B.
    they could defeat
  3. C.
    they did defeat
  4. D.
    had they defeat

John must have forgotten to return the magazine to the library yesterday, _________?


  1. A.
    mustn’t he
  2. B.
    hasn’t he
  3. C.
    haven’t he
  4. D.
    didn’t he

The hostess left the money on the table _____purpose to test the honesty of her maid


  1. A.
    with
  2. B.
    in
  3. C.
    on
  4. D.
    for

______ your blog, I would have written back two days ago．


  1. A.
    If I read
  2. B.
    Should I read
  3. C.
    Had I read
  4. D.
    If I could have read

Eight students ____ ten in our class are League members


  1. A.
    of
  2. B.
    out
  3. C.
    from
  4. D.
    in

He claimed _____my grandmother yesterday, but she passed away tens years ago.


  1. A.
    having met
  2. B.
    to have met
  3. C.
    meeting
  4. D.
    to meet

The young man ____ drugs was sent to hospital yesterday.


  1. A.
    was addicted to
  2. B.
    addiction to
  3. C.
    addicted to
  4. D.
    was addiction to

As we know, in the airport we’re ______ to smoke only in special areas.


  1. A.
    demanded
  2. B.
    made
  3. C.
    asked
  4. D.
    allowed
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