Question

Fill in the blank with one appropriate preposition to complete the following sentence :

I'm very grateful ... you ... your invaluable help.

Answer 1

Fill in the blank with one appropriate preposition to complete the following sentence :

I'm very grateful to you for your invaluable help.

Answer 2

Fill in the blank with one appropriate preposition to complete the following sentence :

I'm very grateful ..to. you .for.. your invaluable help.