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.