【2013甘肃兰州】— Look at the boy playing basketball on the ground. Is it George?— It ______ behim. He told me he would play basketball after class, but he’s notsure.
What are ____________?
----- Sit down please.----- ____________.
----Good morning ! -----___________!
This is book.
— What are those? —. A.Those are books. B. They are books. C. It’s a book.