– Whose ping pong bat is this?
-- I’m not sure. I think it ______be Tom’s.

--Listen! Someone is knocking at the door. Who _____it be?
---It_____be Tom. He phoned to visit me this evening.

-Listen! Is Mary playing the piano in the room?
--No. It ________ be Mary. She has gone to Hong Kong.

—Must I finish my homework at school?— No, you_____. you can do it at home

— Must I finish my homework now?
— No, you _____.
A. mustn’t  B. needn’t C. can’t

—         you speak Chinese, Miss Green?
— Yes, I can.

— Will you stay for lunch?
— Sorry, I ______. My brother is coming to see me.

--- ______ you give your seat to this old man?
--- Of course.

_Can you write a letter in English?
_No, I______.I know only a little English.

--- Must I hand in my report now?
--- No, you ________. You still have some time.