A：Did you ever take History 231?
    B：Yeah. Last semester.
    A：Who was the professor?
    B：It was Professor Johnson.
    A：I have him this semester. What do you think about him?
    B：He's a terrible instructor and demands a lot, but fortunately, he's an easy grader.
    A：What did you end up getting?
    B：I got an A-. Sounds good, but none of my test scores were that high, so I don't know how I got a decent grade.
    A：That's probably because he grades on a curve.
    B：Are you enjoying the class so far?
    A：I hate it and I was about to withdrawal. But after hearing your experience, I think I will tough it out.
    B：Yes. Definitely stay in the class. You will get a better grade than your test scores. He does that deliberately to make all the students study a lot.
    A：Thanks for letting me know. I feel relieved now.