oath

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.

她在婚礼上宣誓要永远爱他。

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

新总统宣誓就职时，庄严地宣读了效忠国家的誓言。

The new president solemnly recited the ___oath of allegiance during the inauguration ceremony.