Thank you so much for...
I am writing to express my thanks for...
I am writing to extend my sincere/hearty gratitude/appreciation for...
I would like to convey in this letter my heartful thanks to you for...
I warmly appreciate your hospitality.
Thank you very much for the gift you sent me.Ii's one of the most wonderful gifts I got on my birthday.
I am writing this letter to thank you for your warm hospitality accorded to my delegation and me during our recent visit to your beautiful country.I would also like to thank you for your interesting discussion with me which I found very informative and useful.
Again,I would like to express my warm thanks to you!Please accept my gratitude.
Thanks again and I hope that I will have the opportunity to return/repay your kindness.
I am looking forward to...
While your family were on vacation,yourfriend Cathy looked after your dog,Smart.Now you came back.Write a letter to her to show your gratitude.
Your letter should be no less than 100 words.You don't need to write the address.Don't sign your own name at the end of the letter;use "Li Ming"instead.
I am writing to express our heartfelt thanks for your taking good care of Smart while we were on vacation.
He was such a happy dog when we got home.We knew he must have had lots of loving attention.When we picked him up from the kennel in your home he would whimper and carryon for hours.
You not only saved us some money,but also spared us the worry about him while we were away.Your kind help is very appreciated,not only by Smart,but also by our whole family.Please accept our thanks again.