单项选择题

(White and black) light, (if mixing) (in) the right proportion, (will show) us grey.

A．White and black
B．if mixing
C．in
D．will show
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单项选择题
It always takes him much (less) time to fly from one city to (another) than (traveling) (by train).
A．less
B．another
C．traveling
D．by train
单项选择题
The headmaster asked the students (who) (had completed) their tests (to leave) the classroom as (quieter) as possible.
A．who
B．had completed
C．to leave
D．quieter
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