indebted

我对您的慷慨相助深表感激。

I am ___indebted to you for your generous assistance.

我们深深感激老师们的辛勤付出。

We are deeply ___indebted to our teachers for their hard work.

我对老师给予我的所有帮助感激不尽。

I am truly ___indebted to my teacher for all the help she has given me.