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
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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
单项选择题
You must follow the directions (exactly), and if you become (confusing), you must (take the time) to go back again and read (them) over.
A．exactly
B．confusing
C．take the time
D．them
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