surprising is the correct answer for both, because the adjective describe the nature of an event/incident. While "surprised" is to describe how one would feel, or get affected by an event/incident. Hope my explanation help :))

I find it surprising that she didn’t like her present. I’m surprised that she didn’t like her present. (Similar meanings)

Surprising is correct

Hello I want to learn how to speak Arabic I can teach you English in return.

Hello, In both of these sentences you need to use 'surprising'. I hope that helps! Luke.