她发誓要放弃熬夜的习惯，以改善睡眠质量。

She vowed to ___forswear her habit of staying up late to improve her sleep quality.

被告在法庭上作伪证，现在面临着严重的法律后果。

The defendant decided to ___forswear in court and now faces serious legal consequences.

为了加入和平组织，他公开宣誓放弃暴力的信念。

To join the peace organization, he publicly ___forswore his belief in violence.

他在法庭上作伪证，结果被判刑。

He was sentenced for ___perjury in court.