Need a dramatic monologue?

If your instructor will allow it, I'd pick something from a movie or TV show you like. Quite a few movies have speeches or long monologues. Just think back to favorite movies or TV episodes of yours. The scripts for most of these can be found on the Internet. Find something by a character you really like or can really identify with. If it is from something you already know and like, it will be easier to memorize.