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
331．force……on把……强加给……
332．in the form of以……形式
333．be fortunate in幸运，有好运气
334．free of charge免费
335．be freed from免受，没有……
336．in front of在……前面
in the front of在……前部
337．furnish……with (=supply)向……提供
338．in general (=in most cases, usually)通常
339．catch (or get) a glimpse of瞥见（强调结果）
take a glance (or look) at看……眼（强调动作）
340．be good for对……有好处；对……有作用
be good at擅长于；be good to对……好
341．in good time (=early)早早地（做完，到达等）
342．for good (=for ever)永远地，长期地
343．take……for granted (=assume to be true)把……认为理所当然的
344．be grateful to sb. for sth.因……感谢某人
345．on the ground(s) of (=because of) 由于……
346．fall to the ground（计划，希望等）失败，落空
347．on one's guard (against) 谨防，警惕 (be)on guard站岗
348．guard against (=defend，keep safe) 警惕,防止guard……against警卫……防止
349．guess at猜，估计
350．by guess靠猜
351．be guilty of犯有……罪或过失
352．be in the habit of习惯于
353．break off (a habit)改掉（某种习惯）
354．break sb. of (a habit)使某人改掉（某习惯）
355．get (fall) into the habit of养成了……的习惯
356．come to a halt (=stop) 停止；停住
357．at hand在手边，眼前（附近）
358．by hand用手工（做）
359．hand in glove (with)狼狈为奸，密切合作
360．in hand 1）在手边2)(=under control)控制住
361．in the hands of由……掌握，控制，负责
362．live from hand to mouth勉强度日，现挣现吃
363．at the head of在……的前头
364．head for (=move towards)向……方向前进
365．hear of (=know about)听人说起，听说过
366．at heart (=in reality)内心里，实际上
367．in one's heart (of hearts)内心深处，事实上
368．by heart (=by memory)熟记，背（诵）
369．to one's heart's content尽情地
370．with all one's heart全心全意地，真心实意
371．hinder……form (=stop……from)阻碍，使……不能做
372．be (go) on holiday在（去）度假
373．be (feel) at home (=to be comfortable; not feel worried)感觉合适，无拘束，熟悉
374．be honest in诚实