they also help to keep people (safe.)为什么不safely,healthy,careful?

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they also help to keep people (safe.)为什么不safely,healthy,careful?
they also help to keep people (safe.)为什么不safely,healthy,careful?

they also help to keep people (safe.)为什么不safely,healthy,careful?
safe.
首先 keep+adj,其次,根据题意 只有 keep people safe 更符合题意