1. Insert prepositions or adverbs. 1. Every tooth consists a crown and one or more roots. 2. It is insensitive pain. 3. Any damage caused decay or injury is permanent. 4. They are cemented together the interprismatic substance. 5. The prisms run roughly right angles the surface. 6. Cementum is similar structure to bone. 7. Dentine occupies the interior the crown and root. 8. Vessels and nerves of the pulp pass the root canal the crown. 9. The outermost layer of the pulp is lined special cells. 10.They run the full thickness of dentine. 11.A tooth is inserted the jaw its root. 12.Any tooth is attached its socket the jaw a soft fibrous tissue called the periodontal membrane. 2. Open the brackets using the necessary Passive Form of the given verb. 1. A tooth (to compose) of enamel, dentine, cementum and pulp. 2. The dentine (to cover) by enamel on the crown and by cementum on the roots. 3. The deciduous teeth (to know) as milk teeth. 4. Every tooth (to insert) into the jaw by its root. 5. A tooth (to attach) to its socket in the jaw by periodontal membrane. 6. Teeth (to use) for catching and chewing food. 7. The outermost layer of the pulp (to line) with special cells. 8. The alveolar process (to cover) with gum.