281. in the twinkling of an eye 一眨眼,转眼间

282. keep an eye on(=keep a watch on)照看,监视

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

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

285. in the face of 面对着(困难等情况)

286. in one’s face当着某人的面; face to faced面对面; face up to 大胆面向

287. fail in (=be unsuccessful in) 失败

288. in good faith(=honestly, sincerely) 真诚地

289. keep faith with 对…守信用

290. lose faith in 对…失去信心

291. on faith 毫无怀疑地, 依赖地

292. faithful to (=loyal to) 对…忠诚

293. fall into the habit (of) 养成…习惯

294. fall short of (=fail to reach a desired result, standard, etc.) 没达到, 低于

295. familiar with 熟悉,了解

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

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

298. by far 远, 非常 (与比较级或最高级连用)

299. far from 远远不是

300. far from 非但不…(而且)