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