我真诚地希望这样的事情永远不要再发生。

I ___sincerely hope that this never happens again.

我们真诚地希望您能考虑我们的建议。

We ___sincerely hope that you will consider our suggestion.

我想真诚地感谢您在这个项目上给予的无价帮助。

I would like to ___sincerely thank you for your invaluable help on this project.