单项选择题

George had difficulty in swimming across the lake, but he finally succeeded on his fourth________.

A．attempt
B．display
C．effort
D．trial
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单项选择题
There is no point________ in the dangerous place if you can't do anything________ the people who have to stay there.
A．remaining...helping
B．to remain...to help
C．in remaining...to help
D．in remaining ... helping
单项选择题
The shutdown of the machine was due to its________ parts.
A．decayed
B．detective
C．deficient
D．spoiled
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