1. bigger

2. bored

3. heavily

4. nervously

5. worse

6. more expensive

7. more talkative

8. many

9. higher

10. more complex

11. better

12. fast

13. more upset

14. more difficult

15. louder

$1.$ bigger and bigger

$2.$ more and more bored

$3.$ heavier and heavier

$4.$ more and more nervous

$5.$ worse and worse

$6.$ more and more expensive

$7.$ more and more talkative

$8.$ more and more

$9.$ higher and higher

$10.$ more and more complex

$11.$ better and better

$12.$ faster and faster

$13.$ more and more upset

$14.$ more and more difficult

$15.$ louder and louder