他牺牲自己的生命救了四个人。

He rescued four people at the ___cost of his own life.

她终于得到了想要的工作，但付出了巨大的个人代价。

She finally got the job she wanted, but at great personal ___cost.

和蒂姆争论不值得，我为此付出了代价。

It's not worth getting into an argument with Tim, as I learned to my ___cost.