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?

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