I'll be back ..... an instant. I just have to run to the bathroom, and I will return very shortly. (*) on (*) in (*) under (*) out
This is a companion discussion topic for the original entry at https://english.best/questions/17225,ill-be-back-___-an-instant-i-just-have-to-run-to-the-bathroom-and-i-will-return-very-shortly/