One of the methods of introducing foreign genes into a plant is to make use of certain soil bacteria to infect the plant and transfer several of blue genes to the infected plant cells, _____ in high rate of plant cell pision.


  1. A.
    results
  2. B.
    resulting
  3. C.
    to result
  4. D.
    resulted

Professor Smith and Professor Brown will _____ in giving the class lectures.


  1. A.
    exchange
  2. B.
    alter
  3. C.
    shift
  4. D.
    alternate

Barack Obama told millions ______ him that his grandmother's influence on ______ he is and the way he views the world was significant.


  1. A.
    watch; how
  2. B.
    watching; who
  3. C.
    watched; where
  4. D.
    to watch; what

Careful surveys have indicated that audience ________ teachers and students be more likely to take seats ________ directed.


  1. A.
    like; that
  2. B.
    as; that
  3. C.
    like; as
  4. D.
    as; like

It was in the lab_________was taken charge of by Johnson_________they did the experiment.


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

_______ warmly for his work, he was too         to fall asleep.


  1. A.
    Praising; excited
  2. B.
    Praise; exciting
  3. C.
    Praised, exciting
  4. D.
    Praised; excited

I’ve _____ all my papers but I still can’t find the contract.


  1. A.
    looked into
  2. B.
    looked up
  3. C.
    looked through
  4. D.
    looked after

________ there is going to be a policy change _________ of those things is going to change.


  1. A.
    Unless; few
  2. B.
    Until; few
  3. C.
    Unless; none
  4. D.
    Until; none

Between  and , the number of overseas visitors expanded/rose ________ %


  1. A.
    by
  2. B.
    for
  3. C.
    to
  4. D.
    in

It is not surprising that you are tired. _____, you stayed up until 12 last night.


  1. A.
    Instead
  2. B.
    In fact
  3. C.
    After all
  4. D.
    What’s more
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