Questions 19 to 22 are based on the conversation you have just heard.

A. He had better assess his own ability.
B. He should try to solve some easier problems now.
C. He must study hard to solve the difficult problems.
D. He should find some more complicated problems to solve.

A. Enjoy their rehearsal.
B. Learn his part quickly.
C. See her on Wednesday.
D. Pick her up on Thursday.