情景交际Mary:Hello,Tim.____Tim:There are forty students in our c

情景交际
Mary:Hello,Tim.____
Tim:There are forty students in our class.
Mary:____
Tim:Most of my class exercise three or four times a week.Some students exercise every day.
Mary:____
Tim:Certainly,it's very important for our health.Do you often exercise?
Mary:No,I hardly ever exercise?
Tim:____ I think you should exercise more from now on.
Mary:I think you're right.Thank you.
Tim:____
A.That's all right.
B.How many students are there in your class?
C.I'm sorry to hear that.
D.How often do your class exercise?
E.Do you think it's very important for our health to exercise?