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
If these shoes are too big, ask the clerk to bring you a smaller________.
A．suit
B．set
C．one
D．pair
单项选择题
One must try his best to________ to the new environment.
A．adopt
B．adept
C．adapt
D．apt
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