很多人参加马拉松是为了挑战自己的耐力。

Many people participate in marathons to ___challenge their ___endurance.

他准备好迎接挑战。

He is ready to face the ___challenge.

她决定质疑这项决定的公平性。

She decided to ___challenge the fairness of the decision.

他接受了邻居的下棋挑战。

He accepted his neighbor's ___challenge to a chess game.