1. instead of (=in place of) 代替，而不是… 2. instruct…in (=teach) 教.指导.训练某人… 3. insure…for 把…保险(多少钱). ensure 使安全. assure…(of) 使…确信,保证 4. insure…against 保险…以防 5. intend…for 打算把…给 6. (be) intent on 专心致志, 坚决 7. in the interests of 符合…的利益 be interested in 对…感兴趣 8. interfere in干涉, interfere with打搅,干扰 9. at intervals 每隔一会儿, 每隔一段距离 10. intervene in 干预 11. invest in 投资 12. be involved in (=become connected or concerned) 卷入, 参加 13. by itself (=alone, without help)单独地,靠自己 14. in itself 本身. of itself 自发,自然 15. be jealous of 妒忌 16. jump at (=to be eager to accept)抢着接受, 17. jump on (=scold, tell of) 叱责 18. junior to sb. 年纪较…轻, 职位较…低. 19. (be) keen on 喜爱, 渴望 20. keep a close watch on ( =keep a sharp lookout for) 密切注视