Start Over in Fundamentals course

I’m using the Express Course with classes that I have for 1 quarter. Each quarter I’d like to have it erase all of my work, so I do use “Start Over” when I see that option. I can’t figure out how to reset the “prediction” bubbles so I can explain each of the foils before they make their choice (some are low readers). Is there a way to do that? Also, some bubbles don’t have a start over and I have to use history to go back to the beginning. Anything simpler?