用介词in on under of for填空mike's keys are____the ro m his baseball is____the bed his schoolbad and some books are____the time this is a set_____keys his schoolbag and some books are _____the sofa
mike's keys are_for___the room his baseball is_under___the bed his schoolbad and some books are___the time(?) this is a set___of__keys his schoolbag and some books are __on___the sofa