单项选择题

It is difficult to _____ what the long-term effects of the reform will be.

A．investigate
B．inform
C．broadcast
D．predict
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单项选择题
.Convenience foods which are ready for cooking are _____ in grocery stores.
A．available
B．capable
C．acceptable
D．probable
单项选择题
In the past few years the school has _____ a lot of money improving the teaching equipment.
A．cost
B．paid
C．spent
D．taken
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