他们的候选人应该认输并承认失败。

Their candidate should just ___throw ___in ___the ___towel and admit defeat.

你必须拥有韧性：永不放弃。

You have to possess tenacity: never ___throw ___in ___the ___towel.

经过多年的挣扎，他终于决定放弃并辞去工作。

After years of struggling, he finally decided to ___throw ___in ___the ___towel and quit his job.