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 favour of赞成

　　306. be in favour with受宠，受偏爱;out of favour with失宠，不受宠

　　307. in one's favour(=to one's advantage)对有利

　　308.(be)favourable 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

　　321. for the first time第一次(作状语)

　　322. in the first place首先，第一

　　323. fit into刚好放入

　　324. fit in with(= suit，fall into agreement)合适，相配，一致

　　325.(be)fit for(=right and suitable for)适合

　　326. focus on(=concentrate on)集中在…上;focus sth. on把…集中在…上

　　327. be fond of喜欢

　　328.(be)in force有效，实施

　　329. go into force开始生效

　　330. by force靠武力，强行