下课后他留下来和老师谈话。

He ___stayed ___behind after class to speak to the teacher.

大多数客人都离开了，但有几个人留下来帮忙打扫。

Most guests left, but a few ___stayed ___behind to help clean up.

其他人都回家了，你为什么留下来？

Why did you ___stay ___behind when everyone else went home?