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401.intendfor打算把给 402.(be) intent on专心致志，坚决 403.instead of (in place of)代替，而不是 404.in the interests of符合的利益 405.instructin (=teach)教，指导，训练某人 406.insure for把保险(多少钱);ensure使安全;assure(of)使确信，保证 407.insureagainst保险以防 be interested in对感兴趣 408.interfere in干涉，interfere with打搅，干扰 409.at intervals每隔一会儿，每隔一段距离 410.intervene in干预 411.invest in投资 412.be involved in (=become connected or concerned)卷入，参加 413.by itself (=alone， without help)单独地，靠自己 414.in itself本身;of itself自发，自然 415.be jealous of妒忌 416.jump at (=to be eager to accept)抢着接受， 417.jump on (=scold， tell of)叱责 418.junior to sb.年纪较轻，职位较低 419.(be) keen on喜爱，渴望 420.keep a close watch on (=keep a sharp lookout for)密切注视 421.keepto oneself (=keep secret)不告诉别人 422.to (the best of) ones knowledge据所知 | 
