单项选择题

It would be______ to check your answers carefully before you handed in your paper.

A．worth
B．worthy
C．worthwhile
D．costly
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单项选择题
A ______exercise such as running is helpful to our health.
A．vigorous
B．cautious
C．precious
D．various
单项选择题
The multinational corporation was making a take-over______ for a property company.
A．application
B．bid
C．proposal
D．suggestion
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