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Alright, well, I often have to give oral presentations in school and have picked up on a few things. First things first, the idea is irrelevant. Basically, it really doesn't matter what you're topic is, because you have got to keep it interesting. It doesn't matter if you have the most interesting topic or most fun one in the world--if you bore them with it, you bore them with it.
Anyway, for starters, once you pick a topic (personally, I think a tongue twister is a little too short for four minutes unless you REALLY drag it out, which equals boring, whereas Dr. Seuss, if timed properly, can work) you have to ENGAGE YOUR AUDIENCE.
Meaning, if you notice one classmate start looking bored or their attention is drawn to something else, engage them. Show others that you're interested in them, too.
EX) Bob is looking away or doing his own thing. You: "Bob, did you know..." or "Bob, what are you looking for in..." Depending on your topic. Find a way to get them involved, even if it's just by calling them out.
I think a common follow up is to maintain eye contact. Don't ever talk directly at someone, though (unless doing something like the above) when you're presenting in general. No one likes being talked AT. There's a difference between talking TO someone and talking AT them. Tip: No one knows what/whom you're looking directly at. Even if your eyes are sweeping across the room or flicking to inanimate things, it appears that your are looking at others.
So enough of that type of stuff. Concept two includes actually keeping it upbeat. Don't start droning on and on about something. Keep whatever you're doing short and sweet. Take our Dr. Seuss example. You don't just want to read them the book. They can read on their own. They don't need you there reading to them because you'd have better chances just handing out the story and asking if they have questions. Therefore, if you want to cite the book, fine. But build up on it. If you must read to them, act it out. Heck, you could even call up volunteers or ask your friends in advance if they can surprise the class. Make up voices--if you don't like that, make a few copies of the pages. Ask for volunteers to help bring the story to life and let them read and act while you call pauses to explain or do your thing. There are always a few in class that love to do stuff like that.
Bottom line, (since this is getting a little long and redundant) just make sure your audience is involved. Rule 1: They're only there listening to you and your project because they have to. They aren't really interested in you, some will act that way to be courteous, but no one's attention is really hooked. Therefore, regardless of your topic, you need to make sure your audience is captivated, even if it's simply by including them.
Best of luck!
(P.S. I'm sure you could research more ways in which you could include your audience!)