A、Triumph. B、Significant. C、A sense of burning. D、Pretty tired. Dburnt out意为“极度劳累”，可知D符合此意。

W: I have read your letter here. You seem to have done well at school. Can you tell me something about your school work?
M: As you can see, my strongest subjects were art subjects. My best subject was history and my second best was geography. However, my favorite subject was math and the results I got in the math paper were quite reasonable.
Q: According to the conversation, what subject is the man not strong in?

W: How do you feel at end of the teaching day? You finished your last class just a few minutes ago?
M: Well, usually, I am fairly; I think the expression is, "burnt out." But I think, generally, as soon as that last bell rings and the kids go out, there is a kind of a .. .a retrospective period.
Q: How does he feel at the end of the teaching day?