walk on feet 还是 walk on foot

walk on feet 还是 walk on foot on feet 和 walk 有什么区别 I often go ?.?处是填by foot,by walk,on feet还是on foot? walk on ice 还是 walk in ice? walk on she can walk with her foot 还是feet now walk this way还是walk on this way go for a walk还是go on a walk? walk on the street还是用in? walk ______Nanjing Road.填in还是on walk cross还是walk across walk walk walk walk walk walk walk