单项选择题

in the meantime, the question facing the business is whether such research is ______ the costs.

A．worth
B．worth of
C．worthy
D．worthwhile
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单项选择题
Seeing a snake ______ on the ground, the baby cried into tear.
A．gliding
B．skidding
C．slipping
D．prancing
单项选择题
Although he made a big fortune in the lottery, he is still very ______ of his money.
A．economic
B．thrifty
C．frugal
D．careful
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