Words fail me when I want to express my gratitude to you for reading through this letter.
② 谢谢您有耐心读我这封信。
I am profoundly grateful for your patience to read through this letter.

（2）表示要求的句型
① 我希望你能考虑一下我地投诉并不要让其再一次发生。
I hope that you would take my complaint into consideration and exhaust every effort to prevent it from recurrence.
② 我真诚地希望你能站在我的角度想想并接受我的道歉。
I sincerely hope that you will be able to think in my position and accept my apology.

（3）表示期待的句型
① 期待你对这一问题给予足够地关注和恰当地解决。
I am looking forward to your due attention and proper solution on this matter.
② 在你方便地时候请尽早给我们答复。
Kindly let us have your reply at your earliest convenience.