There is a book we use Newtonian Tasks Inspired by Physics Education Research: nTIPERs (Addison-wesley Series in Educational Innovation) https://www.amazon.com/dp/0321753755/ref=cm_sw_r_cp_api_fab_ov6GFbAMA142W
It’s full of great physics CER. Really any question in this physics book will be a open concept that follows the CER format or can be with 30 seconds of work