You are chairperson of the Students, Union of Yuming College. Write a letter to invite Mr. Smith, professor of sociology, to deliver a speech at a prize-awarding meeting at your college. In the letter, tell him
① the purpose of the meeting,
② the importance of his presence and speech, and
③ the time and place of the meeting.
Don’t forget to tell him your phone number (555-5555) and your email address (liping@123.com). Please sign your name as Li Ping.
(150-200 words)