On the last day he made a big decision.It was the----day of his holiday.

首先,在这里明确一下,最后一天应该填一个形容词来修饰后面的名词.end为动词（结束）,其名次为,“末尾,最后”比如in the end （最终,即in the final,语气比其舒缓）at the end of （在……的末尾,在……的尽头）,不合...