281．in the twinkling of an eye一眨眼，轉(zhuǎn)眼間
　　282．keep an eye on (=keep a watch on)照看，監(jiān)視

　　283．in the eyes of in one’s eyes (= in the judgment of)在某人看來，在某人眼里

　　284．on the face of it (=judging by what one can see)表面看來

　　285．in the face of面對(duì)著（困難等情況）

　　286．in one’s face當(dāng)著某人的面；face to faced面對(duì)面；face up to大膽面向

　　287．fail in (=be unsuccessful in)失敗

　　288．in good faith (=honestly，sincerely)真誠(chéng)地

　　289．keep faith with對(duì)……守信用

　　290．lose faith in對(duì)……失去信心

　　291．on faith毫無懷疑地，依賴地

　　292．faithful to (=loyal to)對(duì)……忠誠(chéng)

　　293．fall into the habit (of)養(yǎng)成……習(xí)慣

　　294．fall short of (=fail to reach a desired result, standard, etc.)沒達(dá)到，低于

　　295．familiar with熟悉，了解

　　296．have a fancy for (=like sth. without the help of reason）（沒有道理地）喜歡，想要

　　297．take a fancy to (=become fond of)喜歡

　　298．by far遠(yuǎn)，非常（與比較級(jí)或最高級(jí)連用）

　　299．far from遠(yuǎn)遠(yuǎn)不是

　　300．far from非但不……（而且）

301．in fashion (=stylish，most modern) 時(shí)興，流行
　　302．a(chǎn)fter the fashion (of)依照……

　　303．find fault with (=complain about；criticize)找毛病，對(duì)……吹毛求疵

　　304．a(chǎn)t 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(duì)……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．a(chǎn)t first sight (=when first seen)乍一看，一見