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.

你必须具备韧性：永不放弃。

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

尽管遭遇挫折，他决定不放弃，继续前进。

Despite the setbacks, he decided not to ___throw ___in ___the ___towel and kept pushing forward.