A large amount of research _________ to understand sleep.


  1. A.
    has done
  2. B.
    have done
  3. C.
    has been done
  4. D.
    have keen done

The man ________ was a brave emperor was Genghis Khan.


  1. A.
    whom
  2. B.
    who
  3. C.
    which
  4. D.
    whose

Our teacher doesn't let the boy __________ TV too much.


  1. A.
    to watch
  2. B.
    watch
  3. C.
    watching
  4. D.
    watches

They were students when they were in their ________.


  1. A.
    twenty
  2. B.
    twentith
  3. C.
    twenties
  4. D.
    twentieth

The policeman allowed us __________ the road when the lights are red.


  1. A.
    cross
  2. B.
    crossed
  3. C.
    crossing
  4. D.
    to cross

It is wise not to pretend to know ________ you don't know.


  1. A.
    that
  2. B.
    what
  3. C.
    who
  4. D.
    whom

The TV set ________ in Japan is Kangkang's.


  1. A.
    made
  2. B.
    making
  3. C.
    who
  4. D.
    whom

Winter ________ from November to January.


  1. A.
    comes
  2. B.
    has
  3. C.
    takes
  4. D.
    lasts

选出下列单词中划线部分读音不同于其他三个的选项


  1. A.
    days
  2. B.
    ways
  3. C.
    plays
  4. D.
    says

选出下列单词中划线部分读音不同于其他三个的选项


  1. A.
    snow
  2. B.
    blow
  3. C.
    throw
  4. D.
    brown
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