many of them don't know the____(inportant)of doing exercise.

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many of them don't know the____(inportant)of doing exercise.
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many of them don't know the____(inportant)of doing exercise.
many of them don't know the____(inportant)of doing exercise.

many of them don't know the____(inportant)of doing exercise.
importance
作宾语,要用名词