单项选择题

For a long time, Fred watched with delight the water that was running down the rocks and listened to ____ sound.

A．its
B．their
C．his
D．her
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单项选择题
Andrew works in a sports centre, ____ people to use the gym equipment.
A．instructed
B．instructing
C．to instruct
D．instruct
单项选择题
There has been an increase in ____ number of people looking for ____ work.
A．/; the
B．the; the
C．the; /
D．a; the
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