A : Hi, Mary. Why do you look so happy?
     - 안녕, 메리. 왜 그렇게 즐거워?

B : I just aced my history exam!
     - 역사시험을 끝내주게 잘봤어.

A : That's great. What's the grade?
     - 잘됐네. 몇점이야?

B : I got a perfect grade!
     - 만점 맞았어.