1）I was very excited and listened to the talk with increasing interest.
2）I was very interested in the presentation and listened attentively.
I got really excited when listened to the deep and interesting conversation
ワクワクする - get excited, be excited
とても - very
とてもワクワク - very excited
興味 - interested in, interests
深9話 - deep conversation, good conversation
聞く - to listen, listened
I got really excited when I listened to the deep and interesting conversation