单项选择题

Six months ago the World Health Organization recommended that cigarette smoking and the use of plywood and particle board ______ in enclosed areas.

A．be restricted
B．should restrict
C．will be restricted
D．must be restricted
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单项选择题
______ my sister's help we would not have finished the work.
A．If only
B．Except for
C．Now that
D．But for
单项选择题
I bought a quart of milk and six ______ at the market.
A．corn's ears
B．ears of com
C．corn ears
D．ears of corns
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