单项选择题

Don't ______. You'll cross the bridges when you come to them.

A．have worry
B．be worried
C．worry
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单项选择题
Could you please ______ me the way to the airport
A．telling
B．to tell
C．tell
单项选择题
Second-hand ears are ______ to buy than new ones.
A．cheap
B．cheaper
C．cheapest
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