单项选择题

He comes back to his hometown to see his parents at regular ______.

A．gaps
B．pauses
C．intervals
D．spans
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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
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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