A hard-working man _____ become a great scientist, but a great scientist _____ be a hard-working
man.

----Must I finish the work today, Mom?
----No, you _______________. You can finish it tomorrow.

－Is that Mary?
－No, it _______be her. She has gone to Tokyo.

--- That T-shirt with Yao Ming’s picture on it ________ belong to David. He admires him a lot.
---No, it ________ be his. He hates black color.

--Must we move to the next room?
--No, you____________ . You may still live here if you like.

– Must I stay here with you?
-- No, you ______. You may go home, but you _____ go to the net bar(网吧).

— Mary, whose photo is it?
—It ______ be Lu’s. Those are her parents.

He _____ be at home, because the light is on.

— The socks must be Linda’s.
— No, they         be. They’re too small for her.

—_______ I take the newspaper away, please ?
—No, you mustn’t. You _______ only read it here.