请把一篇打乱顺序的英语信件按照正确顺序排列好。  （答案填写字母既可） A.
Dear Ms Masini, B.
yours sincerely C.
We usually try to arrange such visits on Fridays, D.
are 21st May and 4th June. E.
if one of these is suitable for you? F.
In view of your interest in the Institute for the Blind G.
for you to spend a morning H.
Could you please let us know I.
Thank you for your letter of 12th April. J.
visiting our organization, K.
because one of our staff is then free to show guests round the buildings. L.
Two possible dates which we can offer M.
we are extremely happy. N.
Springfield