17.
1. the most popular
2. the most intelligent
3. the shortest
4. bigger than
5. more comfortable than
6. worse
7. more peaceful than
8. the cleverest
9. the most delicious
10. the most boring
11. the most intelligent
12. the oldest
13. more uncomfortable
14. more important
15. healthier
16. more difficult than
17. the most expensive
18. faster than
19. more interesting
20. earlier
18.
1. Gary is taller than Rick.
2. John has got new light trousers.
3. Mary likes bigger clothes.
4. Rick is wearing an expensive coat.
5. Carol has got the shortest scarf.
6. He is the tallest student.
7. Mary was the most popular actress.
8. He was the best footballer.
9. Mary plays better than you.
10. Your father is stronger than mine