—David,is that man your Chinese teacher?—It___________ be him.He’s having a meeting.
These are their ____________. They are very nice.
This is ____________ room. It’s very tidy.
-- Is this eraser __________? --No, it’s not ________. It’s Jim’s.
--Thank you ___________ your English book. -- ____________.
-- ___________, is this your ruler? – Yes, it is. Thank you.