她如此贫穷——我不知道她是怎么活下去的。

She’s so poor – I wonder how she ___lives.

他靠从父亲那里继承的钱生活。

He’s ___living off the money he inherited from his father.

一些寄生虫通过依赖宿主生存。

Some parasites survive by ___living off their hosts.