單項(xiàng)選擇題

Is Linda good at singing? Yes, she is. We often hear her（）in her room.

A.to sing
B.sang
C.sing
D.sings

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In some parks visitors are requested to keep（）the grass.

A.aside
B.away
C.out
D.off

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In order to（）your goals, you must work hard.

A.make
B.achieve
C.require
D.develop