C

1. the nights get longer and longer

2. my brother plays organ better and better

3. the exercises get more and more difficult

4. jane writes less and less carelessly

5. travelling by plane becomes less and less dangerous

6. they plays more and more violently

7.  the old man feels more and more tired 

8. the ready- made clothes become less and less expensive

9. bob works harder and harder

10. the rain falls more and more heavily

D

1. the more quickly the bus ran, the more excited he felt

2. the sooner we start, the more time we'll have for the exploration

3. the older i get, the less i want to travel

4. the smaller the house, the cheaper they are

5. the higher you rise, the harder you'll fall

6. the more proficient he is, the more his fondness increases

7. the sooner we finish work, the sooner we can go home

8. the more you sleep, the much tired you feel

9. the more we travel, the more we love the country

10. the more you know about that country, the more you become amazed