--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.
I ________ watch this TV programme. It’s very interesting.
David, get up early, ________ you’ll catch the early bus.
Millie _________ a picture when Mr. Green came in.
I’m sleepy. I prefer __________ at home to going out for a walk.
This is not my Walkman. It’s _________. Mine is over there.