fall(v.)
向下、落下、倒下

例句：
The snow is falling.
下雪了。

I stepped on ice and fell to the ground.
我踩到了一块冰，跌倒在地。

I fell ill in such a cold day. 
我在这么冷的天病倒了。

foot the bill
付帐

例句：
You should foot the bill first, and then leave.
你应该先付帐，然后再离开。

Who is that speaking?
请问你是哪一位？（电话用语）

也可以说成：
Who is this speaking, please?
May I ask who's calling, please?