听第9段材料，回答第13至15小题。
13.What was Paul concerned about?
A、His professor.
B、His final exam.
C、His physics grades.
14.Why did the woman tell Paul not to worry?
A、The average was important.
B、Chemistry was not his major.
C、He needed to concentrale on physics.
15.What did the woman suggest doing?
A、Studynig harder.
B、Going for a coffee.
C、Repeating the class.