an old man __ the accident __ while he was __ __.该填什么?

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anoldman__theaccident__whilehewas____.该填什么?anoldman__theaccident__whilehewas____.该填什么?anoldman__thea

an old man __ the accident __ while he was __ __.该填什么?
an old man __ the accident __ while he was __ __.该填什么?

an old man __ the accident __ while he was __ __.该填什么?
saw,happen,walking past