单项选择题

Marbles （）once not confined to children.

A. was
B. is
C. were
D. are

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If you don’t（）the children properly, Mr. Robin, they’ll just run riot.

A. mobilize
B. warrant
C. manipulate
D. supervise
单项选择题
What will continue to be（）is today-next in importance to oxygen

A. how
B. which
C. what
D. as
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