These bridges can help people cross roads s _____.填什么?

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These bridges can help people cross roads s _____.填什么?

These bridges can help people cross roads s _____.填什么?
These bridges can help people cross roads s _____.填什么?

These bridges can help people cross roads s _____.填什么?
safely(作状语应用副词形式)

smoothly 顺利地,通顺地
句子意思是这些桥使人们过马路很方便