【正确答案】Sender: lidong@ yahoo.com
Receiver: jackson@ hotmail.com
Topic: Invitation
Dear Professor Jackson,
We sincerely invite you to give a lecture to the students of the English. Department on how to improve English writing skills at the English department meeting room at 2 p. m., on April 12, Sunday. We are looking forward to your early reply.
Yours faithfully,
Li Dong
Secretary of English Department