Ответ:

#1

1. uncle's

2. Teacher's

3. Teachers'

4. Children's

5. Child's

6. More interesting

7. Long

8. Most poisonous

9. Worst

10. Best

11. Slowest

12. Oldest

13. Younger

14. Him, his

15. Second

#2

1. Are spoken

2. Are found

3. Are taken

4. Is used, is dug, is made

5. Are sold

6. Were destroyed

7. Was founded

8. Were taken

9. Were left

10. Will be offered

11. Was repaired

12. Will be repaired

13. Is repaired

14. Was changed

15. Are kept