单项选择题

If these shoes are too big, ask the clerk to bring you a smaller________.

A．suit
B．set
C．one
D．pair
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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
单项选择题
I always keep candles in the house________ there is a power cut.
A．lest
B．for fear that
C．in case
D．because of
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