从方框中选择恰当的介词填空
in, on, under, for, of
【小题1】Tom's keys are ________ his schoolbag.
【小题2】Her basketball is ________ the bed.
【小题3】My schoolbag and some books are ________ the desk.
【小题4】This is a set ________ keys.
【小题5】Thanks ________ your bike Mine is broken(坏了).