329. in the world 究竟,到底
330. in time 及时
331. in touch 联系,接触
332. in turn 依次,轮流;转而
333. in vain 徒劳,白费力
334. indifferent to无兴趣,不关心
335. indignant with sb.愤慨
336. inferior to级别低于,不如
337. innocent of无...罪,无辜
338. instead of 代替,而不是
339. intent on专心于
340. invisible to不可见的
341. jealous of嫉妒
342. just now 眼下;刚才
343. keep one's eyes on关注
344. keep on爱好,很喜欢
345. keep track of 留心
346. kind of / sort of有点somewhat 347. lay off 下岗
348. leave alone别说
349. let the cat out of the bag泄露秘密350. liable for对...有责任