他正在院子里耙树叶。

He was raking up ___leaves in his yard.

到十一月初，天气变冷，树木开始落叶。

By early November it’s getting cold and the trees are starting to lose their ___leaves.

我在三明治上加了一片新鲜的生菜叶。

I added a fresh lettuce ___leaf to my sandwich.