那位年轻选手是这场比赛中最有潜力的赛跑者。

The young athlete is the most promising ___runner in this competition.

这位候选人在最后一场辩论中表现非常出色。

The ___runner performed exceptionally well in the final debate.

那位短跑选手是个真正的快跑者，在比赛中总是领先。

The sprinter is a true ___runner, always leading in races.