Hopefully the chance would be offered to me. If chosen/elected, I would dedicate all my energy and wisdom to the company/activity/club/class. Thank you for reading my letter/ listening to my speech in such a hot summer. Looking forward do your reply at your earliest convenience./ I won't let you down.(我不会让你们失望)
I, on behalf of my whole family/class/school, would like to thank you again (for what you have done) (for me/us). May you be blessed (in everything you do).
We are sincerely looking forward to your coming. My schoolmates/family and I would feel much honored if you could make it. I would like to meet you at the school gate and please drop me a line or give me a call to let me know your decision soon. Thank you.
Hopefully these suggestions will be of great help to you. If there is anything else I can do for you, please let me know as soon as possible. I'm sure you can solve your problem before long.
helpful --- of great help
beautiful--- of great beauty
difficult -- of great difficulty
different - of great difference
useful --- of great use
harmful --- of great harm
Hopefully your kind and timely help would be offered to me. Looking forward to your reply at your earliest convenience.
Hopefully you would accept my sincere apologize.
注：六种书信最后的结尾都是:Best wishes, / Yours truly, /XXX