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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单项选择题
No one could come up with an easy solution to the government's predicament-labor ______ which is caused by the wars.
A．decline
B．vacancy
C．rarity
D．shortage
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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