I believe it would be the second passage because an ellipse is used when a word, phrase or thought is left out but the reader still understands the intended meaning. In choice two, the narrator is speaking of school and making a point that he had never heard of a school for coloured people and restates it at the end that this was the first time he heard of it. It lets the reader imagine what must be going through his mind without stating it in the writing.
Personally, I think you need to answer this question yourself because if you do end up talking to your parent/teacher, then it wouldn't be exactly like the way I describe how I do it, but anyways:
I can lock eyes with them to make sure they know I'm listening and not disregarding what they say, I could also keep still to be able to hear what they are saying and not be distracted by other things around me.
After I listen to what they say, I'll answer what they are asking based on what I know or what they have asked. If it's something that I have to answer, then either answer right away if you know it, or let them know that you need a second to reply to their question.
