This ppt includes a game and it is based on Backpack 4, units 4, 5 and 6. It contains the following topics: extinct/ endangered animals, life in the past, and health and illnesses. Divide your class into two teams. Ss take turns to choose letters A-T and answer the questions. If their answer is grammatically correct, they'll get the point. If they choose volcano, they'll lose all their points. Finally the team with more points is the winner. Your students will love it!