根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项.
M：Don’t tell me you’re studying for another exam!
W：61
M：What subject is it this time?
W：Biology, and it’s going to be a hard one.
M：62
W：Yes, I do 63
M：I don’t know how you keep on with it.It’s too hard to become an engineer.I’ll be putting up tall buildings while you’re still a student here64
