单项选择题

(Red and green) light, (if mixing) (in) the right proportion, (will give) us yellow.

A．A
B．B
C．C
D．D
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单项选择题
The (director) and (manager) of the department (are) very strict (with) the employees.
A．A
B．B
C．C
D．D
单项选择题
(It is very) important that the students’’ voice (is heard) by the (authorities) of (all our) schools.
A．A
B．B
C．C
D．D
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