--- _________, where’s my pen? --- __________, I don’t know.
— 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.
_____ your brother_____ baseball?
— ______are my dictionaries ?—They’re in the schoolbag.