他意外地把花瓶从桌子上撞掉了。

He accidentally ___knocked the vase off the table.

她摔倒时头撞到了墙上。

She ___knocked her head against the wall as she fell.

她拿了一把锤子在墙上敲了一个洞。

She took a hammer and ___knocked a hole in the wall.