—Where is Zhang Hua? Is he in the classroom now?
—He          be there, for I saw him in the teachers’ office just now.

— May I smoke here?
— No, you ______ . This is a no-smoking room.

—Hurry up, Mum. The lights are turned on. Dad has been back.
—It _________ be him. He has gone to Shanghai.

— Must I return the book tomorrow?
— No, you ________. You can keep it for three days.

—Morn, must I clean my room now?
—No, you     . You can do it in the afternoon.

----What did your uncle say?
----He told me he _____ call me the next day.

— You  went to town last month, What  do you think of it?
— Terrible . I _____ go there _____.

Food safety is important. Rules____ to stop people from food pollution.

You     keep  quiet  in the library because everyone is reading here.

—What do you think people can do for their aged parents?
—They_________ do anything except to be with them and be themselves.