---There is somebody knocking at the door. Who________ it be?---I’m not sure. It ________ be a postman.
I don’t ___________ a dictionary. She ___________ one.
--- Do you have any empty bags? --- ___________, I___________.
They don’t have ___________ colour pencils,but I have ___________.
--- ________ under the tree? --- No,they aren’t.
--- ________ my baseball? --- It’s under the chair.