301. in fashion(=stylish, most modern)時(shí)興,流行
　　302. after the fashion (of) 依照…
　　303. find fault with(=complain about; criticize)找毛病，對…吹毛求疵
　　304. at fault (=in the wrong, blamable)有錯(cuò)
　　305. in favour of 贊成
　　306. be in favour with 受寵, 受偏愛;
　　out of favour with 失寵, 不受寵
　　307. in one’s favour(=to one’s advantage)對.有利
　　308. (be) favourable to(=advantageous)有利的
　　309. fear for (=be afraid for the safety of sb. or sth.) 為…擔(dān)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) 擔(dān)心
　　312. feed (sb.) on sth. 靠吃…, 用…喂養(yǎng)
　　313. be fed up with(=be unhappy, tired about sth. dull) 厭煩, 膩了
　　314. feel like (=have a desire for) 想要
　　315. fill in 填寫
　　316. fill out ( =fill in )填寫
　　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)干冒險(xiǎn)事
　　319. set sth. on fire(=set fire to sth.)使..著火,放火
　　320. at first sight(=when first seen)乍一看,一見
　　321. for the first time 第一次 (作狀語)
　　322. in the first place 首先, 第一
　　323. fit into 剛好放入
　　324. fit in with ( = suit , fall into agreement) 合適, 相配, 一致
　　325. (be) fit for (=right and suitable for) 適合
　　326. focus on (=concentrate on) 集中在…上 focus sth. on 把…集中在…上
　　327. be fond of 喜歡
　　328. (be) in force 有效 , 實(shí)施
　　329. go into force 開始生效
　　330. by force 靠武力, 強(qiáng)行