---Will you please stay here for the party?---Sorry, I _____. I have to go to visit my grandfather in hospital.
— Let’s play _____ football. —That _____ good.
A set of keys ____ in the library. Are they yours?
— Where _______your books? — _______ in the bookcase
— Does David have a ping-pong ball? —________. But he has some tennis balls.
.Hi,Linda. This _____ my sister and those ______ my brothers.