protract|protracted

医生建议不要拖延治疗，以免病情恶化。

The doctor advised not to ___protract the treatment to avoid worsening the condition.

这场会议因为持续的争论而拖延了很久。

The meeting became ___protracted due to ongoing disagreements.

这场谈判持续了很久，因为双方都不愿意让步。

The negotiation became ___protracted as neither side was willing to compromise.