羊群在英格兰南部的起伏草坡上吃草。

The sheep were grazing on the grassy ___downs in southern England.

小鸟的绒毛摸起来非常柔软。

The baby bird's ___down feel incredibly soft to touch.

最近分手后，他一直情绪低落。

He's been feeling ___down since the breakup.

他们在第四次进攻中终于成功推进了球。

They finally advanced the ball on their fourth ___down.