填副词或介词
问题描述：
填副词或介词
He did not know how to fight,but he knocked the boxer ----------.
This flowerpot is broke.who knocked it -------.
I knocked------early yesterday and went to a football match.
Listen!Someone is koncking------the window.
答
down 击倒
over 打翻
off 下班
at 敲打门窗