这条路很陡，所以小心别摔倒。

The path is very steep, so be careful you don't ___fall.

到了冬天，所有的叶子都从树上掉落了。

By winter, all the leaves had ___fallen off the trees.

我在冰上滑了一下，差点摔倒。

I slipped on the ice and almost ___fell.