她发誓要戒掉甜食来保持健康。

She decided to ___forswear sweets to maintain her health.

为了健康，他决心彻底戒掉甜食。

For the sake of his health, he ___forswore all sweets completely.

他被迫在宣誓下放弃之前的陈述。

He was compelled to ___foreswear his previous statement under oath.