回顾高中生活，我对所有老师和同学们充满感激之情。(grateful)

Looking back on my high school life, I am very grateful to all my teachers and classmates.

考查现在分词和固定短语。句子陈述事实，可用一般现在时。“回顾” 是动词短语look back on，和主语I是逻辑主动关系，look back on用现在分词形式作状语，“我的高中生活” 为my high school life；“对……感激” 为be grateful to，主语为I，be动词用am，副词very作状语修饰形容词grateful；“所有老师和同学们” 为all my teachers and classmates。故翻译为：“Looking back on my high school life, I am very grateful to all my teachers and classmates.”。