If Doric continue doing things like that, he _______ face the music one day！

 -- Can I tell Peter about the news?-- No, I don’t want anyone else to know it. You ________ keep it to yourself. 

— What does the sign over there say?— No person ______ enter the area without the official permission.

---I think Helen is at home.---No, she    be at home, for she phoned me from the airport just five minutes ago.

—Are you coming to Jeff's party?—I'm not sure.I ________ go to the concert instead.