—What do you think of the four classics (名著) of China?—They are wonderful, but I’ve read ______ of them.
-----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.