about,at,under,in,on,behind,down,up
—Yes, please.
—It's the door.
—Great!
—She's my friend, Yang Ling.
—No, thank you.
— It's under the desk.
—_____, it isn't.
⑴ A. chair
⑵ B. under
⑶ C. behind
⑷ D. desk