Here's a quiz I found online made by Nikita Kovalyov. I added some pictures and a gap-fill exercise in a simple ppt.

My 6th grade's finished the "I'm stronger than you" lesson in their text, so this is a nice review of comparatives and superlatives for them with a global theme.

Have your students write down their guesses as you go, so they don't forget what they answered. At the end have them do the fill in the gap exercise with the right answers.

Enjoy^^