---Who is the tallest boy?      ---It ______ be John.. John is of medium height.

—Look at that girl! Is it Susan?—No, it _______ be her. She has gone back to her hometown.

Charlie ______ be really difficult at times even though he’s a nice person in general.

Eddie _________ sleeping __________ going out.

—I think I’ve got a bad cold, Doctor, Shall I take some medicine?—No need. Your body itself is able to            the virus. Just drink more water and rest.