单项选择题

When the engine would not start, the mechanic inspected all the parts to find what was at ______.

A．wrong
B．trouble
C．fault
D．difficulty
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单项选择题
It is well-known that the retired workers in our country are ______ free medical care.
A．entitled to
B．involved in
C．associated with
D．assigned to
单项选择题
The farmers were more anxious for rain than the people in the city because they had more at ______.
A．danger
B．stake
C．loss
D．threat
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