我站起来的时候头撞到了架子上。

I ___bumped my head on the shelf as I stood up.

她和孩子们玩耍时膝盖撞到了桌子。

She ___bumped her knee against the table while playing with the kids.

小心别让你的手肘撞到门框上。

Be careful not to ___bump your elbow on the doorframe.