假设你正在筹备一次英语角活动，打算邀请英国志愿者Mike参加并进行指导。请你给他写一封英文电子邮件发出邀请，内容包括：
◆简要自我介绍
◆活动安排（时间、地点、话题）
◆向他发出邀请并希望得到回复
请以Li Ke署名
Dear Mike,
I am writing on behalf of all the students of our department to invite you to join in an activity in our English Corner.
The main topics are on exchanging Chinese and American school life, outdoor activities and festivals that appeal to teenagers. The activity will be held in the library this Saturday afternoon. We really want you to come and join us.
Please let me know whether you could come or not.
Yours sincerely,
Li Ke
