当他未能出席会议时，他违背了一个承诺。

He ___broke ___a ___promise when he failed to show up for the meeting.

公司通过未能在截止日期前完成违反了协议。

The company ___broke ___the ___agreement by not meeting the deadline.

违背协议可能导致严重的法律后果。

___Breaking ___an ___agreement can lead to serious legal consequences.