Here is the completed description:
1. Chocolate is made (make) from cocoa beans. They come from the fruit of the cocoa tree.
2. The beans are dried (dry) in the sun.
3. Then they are taken (take) by train or lorry to a factory.
4. In the factory, the beans are cooked (cook) in a special oven.
5. Milk and sugar are added (add).
6. Finally, the mixture is cooled (cool down) to make chocolate!