justify

对成功的渴望并不能成为粗鲁行为的正当理由。

A desire for success does not ___justify rude behavior.

他试图用工作忙来为自己迟到辩解。

He tried to ___justify his lateness by saying he was busy with work.

我实在找不到理由再请一天假。

I can't really ___justify taking another day off work.