单项选择题

The suggested causes of a given phenomenon cannot always be independently observed, and so it is hard to ______ the possibility of there being explanations alternative to the one proposed.

A．account for
B．rule out
C．guard against
D．do with
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单项选择题
I've worked with him now over the course of four years, I know him ______.
A．here and there
B．back and forth
C．backwards and forwards
D．now and then
单项选择题
The trouble is that various worldly pressures will make you more, not less, inclined to play it ______.
A．safe
B．safely
C．to safety
D．in safety
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