Is this red bag yours?—No, it isn’t. is that black one.

How old is your son? — Five.—We will have a special party for his birthday .

The boys and girls often play_______ football in_______ afternoon.

Some students often drop litter carelessly in our school. What can we do?- We can _______ some signs to remind them not to do that again.

If you hard, you a good grade in the exam.