I love the way you say (put) things in your letters. You make even
            the smallest incident seem so
            interesting(important)(charming)(mysterious).
            我很欣赏您在信中描述各种事物的手法。您的妙笔使细小的事情都显得很有趣（重要）（动人）（神秘）。 (来源：英语交友 http://friends.englishcn.com)

            It was good (fine)(charming)(thoughtful)of you...
            承蒙好意（美意）（盛情）（关心）……

            It was nice(characteristically thoughtful) (more than kind) of
you...
            承蒙好意（特别关心）（十二分好意）……

            At the outset, I want to thank you for your kindness to me and for
            your compliments.
            首先，我要感谢您对我的友爱和问候。

            Believe me, I am truly grateful for...
            我确实真诚地感谢你……

            We were deeply touched by ...
            ……使我们深受感动。

            It is a hopeless(definite)(positive)understatement to say that I am
            deeply (sincerely)(truly)grateful.
            这就是说“我深深的（真挚的）（真诚的）感谢”远不足以（不能确切）（不能明确）表达我的谢意。

            It's generous of you to take so much interest in my work( to give me
            so much of your time) (to show me so much consideration).
            承蒙对我的工作如此操心（为我花费这么多时间）（对我如此关怀）。

            We are indebted to you...
            我们感谢你……

            I regret very much that I did not have an opportunity to thank you
            personally for ...
            未能面谢，深表遗憾。