—Listen! Someone is singing in the next room. Who ____ it be? Is it Li Wei?—No, it ______ be her. She is at school now.
– Congratulations! Your speech is very good. -- _______
The bus is coming. Be careful when you _____ the bus.
He is always the first boy ____ gets to school.
– What do you think of my shirt? It _____ cotton. -- It looks nice on you.
The picture _____ you like best _____ by LiWei.