单项选择题

If you don't ______ smoking you will never get better.

A) give off
B) give up
C) give in
D) give out
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The writer was so absorbed ______ his job that he did not notice me enter the room.
A) on
B) of
C) in
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It is requested that every student ______ a paper on the rapid development of industry.
A) writes
B) wrote
C) writing
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