312.feed (sb.) on sth. 靠吃……，用……喂养
313.be fed up with (=be unhappy， tired about sth. dull)厌烦，腻了
314.feel like (=have a desire for)想要
315.fill in填写
316.fill out (=fill in)填写
317.set the world on fire = set the flames on fire (=do sth. remarkable)有突出成就
318.play with fire (=take great risks)干冒险事
319.set sth. on fire (=set fire to sth.)使……着火，放火
320.at first sight (=when first seen)乍一看，一见
