Cool. You could also try making the question generate the answer that is the current sentence you're working with:
Liest du es? can be answered with just yes or no, but if you ask: "Was liest du?"
Then one could answer with the given sentence, "Ich lese es." :)
Danke, aber was heißt es?
Es heißt Harry Potter und der Stein der Weisen.
Wer hat das Buch geschrieben?
J.K. Rowling duuuuhhh.
And thus starts the runaway dialogue until you remember that you're still only on the first sentence of your lesson...