The doctor warned us ______ the ______ of the germs(病菌) by cleaning our hands from time to time.A. controlling, spreadB. to control, spreadC. to control, development
— 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.