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單項選擇題

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

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In order to（）the disease, the first thing we should do is to do research about it and find out a satisfactory cure.

A.confirm
B.conduct
C.control
D.confuse