单项选择题

We have ______medical service.

A．priceless
B．free charge
C．no charge
D．free
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单项选择题
Indeed, almost every scientist now finds it is impossible to read all the works relevant to his own subject,______. extensively outside of it.
A．much more to read
B．much less to read
C．much less reading
D．still more reading
单项选择题
He ______unwisely, but he was at least trying to do something helpful.
A．may have acted
B．must have acted
C．should act
D．would act
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