单项选择题

But from the start of their experiments, the Wright brothers found that they needed money to pay _______ their research.

A．back
B．down
C．for
D．off
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单项选择题
If you don't put the cheese in the refrigerator, it may ______.
A．go of
B．go out
C．go over
D．go wrong
单项选择题
Shall we walk through the park No, it's too late ______ there.
A．that we walk
B．for us walking
C．us to walk
D．for us to walk
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