【正确答案】[参考范文]
Dear Dr. King,
The Department of Computer Science of Beijing University would like to extend to you an invitation to be our guest speaker at the annual conference to be held at the speech hall of our department at nine o' clock, Saturday morning, November 11 th, 2004.
As you know, the department is interested in the future development of the computer science. Since you are an expert in the field, we are quite interested in your speech.
You ;viii receive further details later, but we would appreciate having your acceptance soon so we may complete our agenda.
Cordially,
Wang Ling