Lots of great suggestions have already been provided.
Just another thought.
Could you somehow switch this into a teaching time?
We are always telling the kids that good readers ask themselves questions while they are reading, make and confirm/discard predictions, wonder about things etc
Could you give them sticky pads and pencils and stop from time to time and ask them to record their questions?
You could use a Q-chart, KWL or RAN Chart to organize the stickies.
I don't do this with every read aloud. Sometimes I just want to read a story for the pure joy of reading.
