长途旅行前，孩子们被告知如果需要就去洗手间。

Before the long trip, the kids were told to ___go ___to ___the ___bathroom if they needed.

他差点错过航班，因为他得去上个厕所。

He almost missed his flight because he had to ___go ___to ___the ___bathroom.

抱歉，我需要去一下洗手间。

Excuse me, I need to ___go ___to ___the ___bathroom.