他一听到批评就立刻生气了。

He ___bristled immediately when he heard the criticism.

狗狗感到害怕时，背上的毛会竖起来。

The dog's fur ___bristled when it felt scared.

那只旧牙刷的刷毛又硬又直，根根直立。

The old toothbrush ___bristled with stiff, upright hairs.