.in fear of (=afraid for the safety of)擔(dān)心

　　.feed (sb.) on sth. 靠吃……，用……喂養(yǎng)

　　.be fed up with (=be unhappy, tired about sth. dull)厭煩，膩了

　　.feel like (=have a desire for)想要

　　.fill in填寫

　　.fill out (=fill in)填寫

　　.set the world on fire = set the flames on fire (=do sth. remarkable)有突出成就

　　.play with fire (=take great risks)干冒險事

　　.set sth. on fire (=set fire to sth.)使……著火，放火

　　.at first sight (=when first seen)乍一看，一見

　　.for the first time第一次(作狀語)

　　.in the first place首先，第一

　　.fit into剛好放入