这辆公交车是城里最慢的。

This bus is the ___slowest one in the city.

在所有选手中，他是完成比赛最慢的。

Among all the players, he was the ___slowest to finish the race.

他在理解新概念时总是最慢的那个。

He's always the ___slowest one to grasp new concepts.