听音，选出你所听到的句子。(20分)
(　　)（1）A.Hi，Lucy!                     
B．Hello，Lucy!
C．Goodbye，Lucy!
(　　)（2）A.Good afternoon!               
B．Good morning!
C．Goodbye!
(　　)（3）A.How are you?                  
B．I'm fine.
C．I'm Sam.
(　　)（4）A.Thank you.                    
B．Afternoon，Mr Li!
C．I'm Mr Li.
(　　)（5）A.Morning，girls!               
B．Morning，boys!  
C．Morning，boys and girls!