单项选择题

It is (necessary) that she (comes) here twice a week (to help) (do) the housework.

A．necessary
B．comes
C．to help
D．do
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单项选择题
(Just) outside (the interest) (of places are) a glorious building (surrounded) by tall trees.
A．Just
B．the interest
C．of places are
D．surrounded
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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