他走在我前面的小路上，然后突然就消失得无影无踪了。

He was on the path ahead of me and then ___vanished ___into ___thin ___air.

被我的几位年长阿姨挤在沙发中间，我真希望能立刻人间蒸发。

Squeezed between my elderly aunts on the couch, I wished I could ___vanish ___into ___thin ___air.

我们正在会议上讨论的那份关键文件，似乎就这么凭空消失了。

The crucial document we were discussing in the meeting seemed to have ___disappeared ___into ___thin ___air.