A:Why didn't you have class yesterday evening?
B:Because I was on business trip/attended a classmate party/worked overtime/felt tired,that's why I didn't have class.
A:In my mind you are seldom absent!
B:Thanks for your praise.But I'm not an iron man/super man.
A:I see.Mrs Wan asked us to buy New Concept English together,it will be 30 percent discount if we buy together.Are you going to buy it with me?
A; OK.
B:Thanks!Give the money to Mrs Wan by that time.
A:All right.See you on next Monday evening!