邀请信 An Invitation Letter
Dear Professor Wang,
On behalf of the Student Union of the English Department, I'm writing to invite you to give us a speech on Chinese History.
We're going to have such a speech at 2:30 p.m. this Tuesday afternoon in the Meeting Room 401.
It would be great honor if you can join in our activity
Please inform us whether you could come. We're looking forward to favorable answer.