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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The (principal) mason for the great (number) of smoke is (that) there are (too many) factories in this are
A． principalB. numberC. thatD. too many
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(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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