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

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

A.its
B.heir
C.his
D.her

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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