There______ a number of natural mysteries in the world that even make scientists ______


  1. A.
    exists; confusing
  2. B.
    are existed; confused
  3. C.
    exist; confused
  4. D.
    exist; confusing

The idea of fish being able to produce electricity strong enough to light a lamp is almost unbelievable, _____ several kinds of fish are really able to do this.


  1. A.
    therefore
  2. B.
    and
  3. C.
    then
  4. D.
    but

Those black clouds are a sure ______ that it’s going to rain.


  1. A.
    thing
  2. B.
    mark
  3. C.
    sign
  4. D.
    one

October 15 th is my birthday, ________ I will never forget.


  1. A.
    when
  2. B.
    that
  3. C.
    what
  4. D.
    which

He got home from work only to find the door ___ and something ____.


  1. A.
    opened, misssed
  2. B.
    opening, losing
  3. C.
    open. lost
  4. D.
    to be opened; to be missed

It was nothing but his ten years of hard work that _______ his success in his research.


  1. A.
    referred to
  2. B.
    applied to
  3. C.
    led to
  4. D.
    appealed to

He spoke English so well that I took _______ for granted that he was an American.


  1. A.
    that
  2. B.
    this
  3. C.
    which
  4. D.
    it

Taking medicine only gives you _______ relief from pain, so I suggest you have an operation.


  1. A.
    flexible
  2. B.
    optional
  3. C.
    temporary
  4. D.
    beneficial

Is this the factory ________ he worked ten years ago?


  1. A.
    that
  2. B.
    which
  3. C.
    where
  4. D.
    the one

When their first child was born, they _________ for three years


  1. A.
    had married
  2. B.
    had been married
  3. C.
    got married
  4. D.
    had got married
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