The girl in the classroom ______ be Maria. She called me from the library just now.
— I’m sorry that John is out. — Please ask him to call me as soon as he __________.
— Shirley, I know you ___________ a book about China, Have you finished it? — Not yet. Maybe next year.
The food ________ because it _________ good.
He __________ when I go to see him.
Great changes __________ in China in the past few years.