他用锤子把凸起的钉子敲平了。

He used a hammer to ___flatten the protruding nail.

我们队在辩论赛中被对手彻底击败了。

Our team was ___flattened by the opponents in the debate competition.

拳击手一记重拳把对手击倒在地。

The boxer ___flattened his opponent with a heavy punch.

面包放了一天之后就变扁了。

The bread ___flattened after sitting out for a day.