000367

63 10. 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 fbrous tissue called the periodontal membrane. Grammar Passive Voice (Revision) 11. Revise the Passive Voice. Sсan the text «Structure of the Teeth. Supporting Structures» and find sentences in the Passive Voice. Trans- late them. 12. Open the brackets using the necessary Passive Form of the giv- en 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 peri‑ odontal 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 proc‑ ess (to cover) with gum. 13. Change the voice of the sentences. 1. Enamel, dentine, cementum and pulp compose a tooth. 2. The special cells line the outermost layer of the pulp. 3. We call the hard bone, covering the exposed part of the crown, the enamel. 4. When disease affects the tooth a man must go to a dentist. 5. Children lose milk teeth during the childhood. 6. Soft tissue called gum covers the part of the jaw containing the teeth.