Do you know _______ man in jeans—Yes. He’s a professor of _______ university.

Mary, do you think you are different from Debbie–Yes, I’m________________ at drawing than her.

Your head teacher says you arereliable and punctual. You are never late for school，are you—___________ .

．—Steve come back because the window is open．—Yes．but he _______left it open last night．

Lin Lin often practices English ____ chatting with her American friend.