They meet an old man when they go home.=They meet an old man_ _ _home.
问题描述：
They meet an old man when they go home.=They meet an old man_ _ _home.
答
on the way
在去。。。的路上
答
你好！ 正确答案为：
They meet an old man when they go home.
=They meet an old man (on their way )home.
在他们回家时碰到一个老人。
on one's way home 在某人回家的路上。
^___^
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答
on their way