Using your ManyCam (or another digital platform), give your students a digital puzzle as your second reward. "You get a star AND a puzzle". This is a great way to teach vocabulary and keep the kids guessing on what they see. "What do you see?"
Introduce the reward on the reward slide: "If you look, listen and say, you get a star AND a puzzle!!" Then show picture 0 and 1.
Here is HOW and WHY I use them. https://youtu.be/iOlv3sN2gb4