__________ can you finish your homework, Ben?－ In thirty minutes.

I haven’t seen ________Maggie since I came here.

He’ll phone you as soon as he ________ Beijing .

By the end of the last month, I _____________ all the CDs of Justin Bieber.

The man in a black suit _______ be our youth worker.— I’m sure it _______ be him. I saw him in the laboratory building some minutes ago.