5. I promise that I
this secret to anyone.

Practice in front of people your close to and work up to bigger groups
I would say that the principle means of characterization employed by the author is dialogue. Since Romeo and Juliet is a play, everything we know actually comes from the conversations, be it a dialogue, or a monologue.
Cave is a smaller section of a cavern. A song is a smaller part of a tune. Therefore, one is the bigger picture (second section) and the other is the smaller picture (first one) Hope this helps!