No student ______ go out of school for snacks during the break without the teacher’s permission.

－Mike, I can’t stop playing computer games.－For your eyes, I am afraid you ______.

Looking after very young children _____ be very annoying sometimes, but you’ll get used to it after a while.

Teachers _______ be sensitive to the development level of each student so as to help them better. 

—Whose purple coat is this?—It ____ be Lily’s. Hers is red. It _____ be Lucy’s. She likes purple.