Thank-you Letter for a Math bookDear Khang,I’d like to express my thanks to you for your Math book which you gave me on my

birthday. I can’t explain how happy I feel when I received it. This is the Math book that I wanted to have and read for a long time. There are many good problems in this book, and I can study from it a lot of new things about Math. This book is very interesting.

Thank to you, my birthday is very wonderful. Thank you very much for your present, my close friend.

Yours very sincerely,Nghia