Fix grammar errors: Right after my own business class, I ran into the room that special lecture on going.
I was in the room that went to the lecture.

The question is, what is the correct way to say it?

• I don't know if it's correct, but I think it's a good idea to ask the question in the first place. – user62942 Jun 27 '15 at 18:06
• @user62942: I think I'll ask it in the first place. –
I was surprised to see that the professor was talking about the's book. I was surprised to see that he was talking about the's book.

I was surprised to see that the professor was talking about the book that I was reading.

I was surprised to see that the professor was talking about the book that I was reading.

I was surprised to see that the professor was talking about the book that I was reading.

I was surprised to see that the