Many first-time researchers appreciate such an arrangement by the instructor because it eliminates the stress of having to decide upon a topic on their own.
So the topic isn’t crucial until you are ready to gather and analyze data and make your own conclusion.
To get your first ideas you may try the brainstorm technique: just get a sheet of paper and pen and write down anything that comes to mind.
But this is also the bad news: if you weren’t given a list of topics, you are facing, actually, the unlimited choice.
Mostly, the research paper in middle school exist to teach you to do the research itself.