Dogs are clever animals and they can be trained to ________ houses. [ ]A. lo

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Dogs are clever animals and they can be trained to ________ houses. [     ]
A. look for
B. watch
C. watch out
D. watch out for

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举一反三

—Thanks a lot, Mr. Wang. I don"t know how to ________ the help you gave me during my stay here.
—It"s my pleasure. Welcome to China again when you have time. [     ]
A. pay off
B. pay back
C. pay for
D. pay to

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Tom"s secondhand car wasn"t in use and for that reason he ________ it in the newspaper.[      ]
A. advertised for
B. fell for
C. wished for
D. searched for

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My father was a heavy smoker. I ________ him to give up smoking, but my words didn"t work.[       ]
A. suggested
B. tried to persuade
C. failed to suggest
D. managed to persuade

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One of the collectors collected some seeds from a tree that had ________ him.  [     ]
A. interest in
B. appealed to
C. been attracted
D. drew attention of

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In the time of social reform, people"s state of mind tends to  ________with the rapid changes
of society.[     ]
A. keep pace
B. keep touch
C. go on
D. make progress

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