单项选择题

You must (follow) the directions (exactly), and if you become (confusing), you must take the time (to go) back and read them over.

A．follow
B．exactly
C．confusing
D．to go
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As (quiet) as possible he (unfastened) the door (and) went out into (the frosty) December night.
A．quiet
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C．and
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(It was) (in the) primary school (where) my teacher introduced (me to) computers.
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B．in the
C．where
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