nail

我踩到了一块板子上突出的钉子。

I stepped on a ___nail sticking out of a board.

我在手提包里放了一个指甲锉以备不时之需。

I keep a ___nail file in my handbag for emergencies.

在墙上钉一个钉子，我们好挂镜子。

Hammer a ___nail into the wall and we'll hang the mirror on it.