48. Please check the items in the bill.　　 Item by item　 逐条的

47. issue　 发行　　 issue sth　　　 the latest isd of the magazine 杂志最新一期

　　 have an issue of 1,000 copies　　 有十万册的发行量

45. involve 包括, 陷于　 be involved in 牵涉　 be involved in doing 专心致志于…

44. inviting　　 吸引人的　　　 The food looks inviting .

43. decline one's invitation = turn down one's invitation 拒绝邀请 at the invitation of 因…邀请

42. invisible　 看不见的, 无形的　 invisible ink隐形墨水　 an invisible man

41. investigate 调查　 investigate the cause of the plane crash.调查飞机失事原因

　　　　　　　　 investigate into = look into 深入调查　 look into the matter

40. invest　 投资　 She invested in house.

39. invade　 侵入　　　 Disease invaded our body.

38. introduce sb to sb　 介绍　 She introduce new method into her business.　 引入

　　　 We have introduced new economic measures.　　 采用