他整晚都在为失去的工作机会闷闷不乐地沉思。

He spent the whole night ___brooding over the lost job opportunity.

母鸡正在窝里孵蛋。

The hen is ___brooding over her eggs in the nest.

暮色降临，忧郁的气氛笼罩着整个小镇。

The ___brooding twilight cast a melancholy mood over the entire town.