------ Who is that man over there? _______ it be our teacher?
------ No, it _______ not be our teacher. It _______ be Mr. Zhang.

—What do you think of your nephew?
—He__________ be very naughty but at the same time you poor.

—ou___________ stop me.
—Even if you __________it, I won't allow you to swim across the river.

Tom suggested that we __________such a meeting, but Jenny insisted that it _________of great importance.

I__________ you somewhere before, but your name has escaped me_________.

You must have waited here for a long time ,___________you?

--Did Mary come to your birthday party?
--No. I __________ her, but she was away on business.

You _________think you're clever, but that doesn't give you the right to order me about!

--Where is Xiao Wang?
--I don’t know. He__________ be in the library.

--Could I use your bike, Jack?
--Of course, you____________.