【正确答案】
Department of English
Foreign Studies University,
Tianjin
June 16,1999
Mr. David Crook
Beijing University
Beijing, China

Dear Mr. Crook,
The teachers of English in our department are deeply impressed by your "A Study of English Grammar" and very interested in hearing in person your ideas on the subject. Would you please come to our department at your convenience?
Of course, you would receive our honorarium to cover your travelling and other expenses.
Please let us know if you can come and tell us when you would be able to do so.
Sincerely yours,
Wang Li