319. set sth. on fire(=set fire to sth.)使..着火,放火

318. play with fire (=take great risks)干冒险事

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

316. fill out ( =fill in )填写

315. fill in 填写

314. feel like (=have a desire for) 想要

313. be fed up with(=be unhappy, tired about sth. dull) 厌烦, 腻了

312. feed (sb.) on sth. 靠吃…, 用…喂养

311. in fear of (=afraid for the safety of) 担心

310. for fear of (=in case of; because of anxiety about) 以防, 由于怕