C．helpful D．wrong
45．A．hit B．miss C．avoid D．push
46．A．stuck B．flowing C．stricken D．flying
47．A．wheels B．lights C．load D．engine
48．A．dropped B．fell C．drowned D．sank
49．A．feet B．hands C．arms D．backs
50．A．reached B．raised C．reduced D．supported
51．A．wood B．stones C．sand D
