The boy has ______of books in his house.

It is the second time that you have been late, ______?

Green organizations are trying to save rain forests that have been _____ by farmers.

I’m sorry, Mr. Li. I ________ my exercise book at home.—Oh, don’t forget ________ it here tomorrow, please.

Listen! Joy is singing in the next room.– It _____ be Joy. She has goneto America.