单项选择题

In the meantime, the question facing business is whether such research is （） the costs.

A．worthy
B．worth of
C．worth
D．worthwhile

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单项选择题
The （） of freedom is eternal vigilance (警惕).

A．cost
B．value
C．expense
D．prize
单项选择题
To do a task promptly is better than （） about it.

A．worry
B．to worry
C．worried
D．worrying
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