It seemed that our nursery rhymes___ some magic because all the nights I sang them for my daughter, she would listen to them with keen pleasure．

— I want someone to write the composition for me. 　— No! It’s a rule in our school that as a student, you _______ depend on yourself. 

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

—Why are those people gathering in the middle of the street?—I don’t know. There ________ be an accident.

________ you interrupt now? Can’t you see I’m on the phone?_ Sorry, Sir, but it’s urgent.