Choose the best anwser

17. I ran ......................... than Tom.
A. more fast B. faster C. fast D. the fastest
18. She can speak English ..........................I can.
A. more well B. best than C. better than D. better
19. Ann is 18 years old. Sue is 20 years old. Ann is ..........................Sue
.A. older than B. younger than C. older D. younger
20. Nobody can cook as ..........................as my mother.
A. well B. best C. good D. better