Relier Pairs InventionsVersion en ligne Based on the unit 7 Good Idea! of the book Our world 4! par Claudia Casanova 1 Try 2 Creativity 3 Useful 4 Battery 5 A problem 6 Invention 7 A Wheel 8 Succed 9 Electricity 10 Fail 11 Invent 12 Idea 13 Imagination 14 A solution