1. A. can't
2. A. was playing
3. B. most
4. C. while
5. A. well
6. B. tallest
7. A. came
8. C. than
9. B. studying
10. B. more
11. B. will
12. A. must
13. B. of
14. C. hard
15. C. friendlier
16. B. was driving
17. A. less
18. A. was
19. B. come
20. C. clever
