301. in fashion(=stylish，most modern)时兴，流行
302.after the fashion(of)依照…
303.find fault with(=complain about;criticize)找毛病，对…吹毛求疵
304.at fault(=in the wrong，blamable)有错
305. in favor of 赞 成
306. be in favor with 受宠，受偏爱;out of favor with 失宠，不受宠
307.in one’s favor(=to one’s advantage)对…有利
308.(be)favorable to(=advantageous)有利的
309. fear for(=be afraid for the safety of sb. or sth.)为…担心
310. for fear of(=in case of;because of anxiety about)以防，由于怕
311.in fear of(=afraid for the safety of)担心
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
