you must hand_in__your homework__on__time.there was a little girl sitting__next___to him.we haven't got a recorder,would you like to buy__us_（we,us）one?they walked__across__（cross,across）the stree...the radio is too loud.please turn it_____(down,up).six bridges have been built___(over,on)the huangpu river in the pastfew years..请继续回答，谢谢~the radio is too loud.please turn it_down____(down,up).six bridges have been built_over__(over,on)the huangpu river in the pastfew years