【正确答案】 Dear Sir or Madam,
I'm organizing a group of students to pay a visit to the historical exhibition in your town. This visit will be part of our school's social survey project. It would be appreciated if you could supply me with the following information. First of all, when will the exhibition be held, and what are the daily opening hours? Secondly, what is the size of the exhibition, what is its theme and what objects are on display? Thirdly, are there any other activities to be held in connection with the exhibition?
Thanks for your attention to this letter and I'm looking forward to your early reply.
Yours sincerely,
Li Ming