单项选择题

Nowadays, our government advocates credit to whatever we do or whoever we contact with. Once you ______ your words, you will lose your social status and personal reputation.

A. keep up with
B. give away from
C. go back on
D. lose sight of
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Stressful environment leads to unhealthy behaviors such as poor eating habits, which ______ increase the risk of high blood pressure and heart disease.
A. in turn
B. by chance
C. by fortune
D. in case
单项选择题
After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and ______.
A. runs away
B. charges for
C. falls off
D. merges into
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