—I failed in the exam.
—I am sorry to hear that. Failure is the mother of ________. Try your best, you will ________.
A. success, succeed
B. succeed, success
C. success, successful
—There is too much ________ on the floor. Why did you make it much too ________?
—Sorry, Miss Gao. I will clean it at once.
A. dirty, dirt
B. dirt, dirty
C. dirt, dirt