单项选择题

He invested a considerable amount of money in the project.

A．immense
B．positive
C．powerful
D．realistic
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单项选择题
Techniques to employ the energy of the sun are being developed.
A．convert
B．store
C．utilize
D．receive
单项选择题
Are you positive that there's been no mistake
A．rational
B．reasonable
C．certain
D．bound
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