—Do you know that China is one of_________countries in the world? —Yes, I do. It’s much________than the U.S
-----Is Henry cleaning his room? ---- ________ .
-----______ are the students talking ______? ----- A policeman.
It’s four o’clock in the afternoon. The boys __ in the pool.
My friend works ___ a hospital ___ a doctor.
He ______ his uniform every day. It’s _______ beautiful.