我突然发现自己正在做午餐。

I suddenly ___found ___myself making lunch.

我们走错了房间，发现自己站在老师面前。

We went to the wrong room and ___found ___ourselves in front of our teacher.

她发现自己不知不觉地跟着收音机唱起歌来。

She ___found ___herself singing along to the radio without realizing it.