C:Hello,A,this is my friend ,B.And this is D.
A:Hello,glad to see you.My name is XXX.What's your name?
B:My name is XXX,glad to see you ,too.
A:what class are you in?
B:I'm in class 5,and you?
A:I'm class 5,too
B:That's great!Are you in row 3?
A;No,I'm in row 4.
D:It's time for class,let's go!
A:Ok.