单项选择题

(Be sure) to put out the light (before) you (leave). Yes, I'll (put out it).

A．Be sure
B．before
C．leave
D．put out it
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单项选择题
The (principal) mason for the great (number) of smoke is (that) there are (too many) factories in this area.
A．principal
B．number
C．that
D．too many
单项选择题
(You don't) have to worry about making yourself (understand) (as) many people here know (a bit) of English.
A．You don't
B．understand
C．as
D．a bit
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