That man ________ be Mary’s father, as he is much taller.

----Listen! Is Kitty in the next room?
---- No, it ______ be Kitty. She has gone to Beijing.

---Look at the boy running on the playground. Is it David?
---It ______ be him. I saw him go to the teachers’ office just now.

----- I want to know if I _________ smoke here.
----- No, you ___________. Can’t you see the sign “NO SMOKING” there?

This lift __________ only hold 12 people. It’s full now. We ________ wait for some more time.

I hear you've got some new Australian coins. __________ I have a look?

You ______ to the party if you’re so busy.

—_____I use your dictionary, Tom?  —Of course, you _______

—Look，your father is playing the piano over there.
—He________ be my father. He has gone to Beijing.

------Is this ruler Mary’s?
------No, it _______Mary’s. Hers is on the desk..