oath|oaths

他踩到钉子时忍不住骂了一句脏话。

He let out a sharp ___oath when he stepped on a nail.

听到这个坏消息，他忍不住骂了几句脏话。

Upon hearing the bad news, he couldn't help but utter a few angry ___oaths.

她在婚礼上宣誓要永远爱他。

She made an ___oath to love him forever at the wedding.