听问题，选择正确的答语。 
（1）A.I’m reading a book.
B.They’re listening to music.
（2）A.It’s up the hill. 
B.No, it isn’t.
（3）A.Yes, I have.    
B.No, I don’t.
（4）A.Yes, we have.  
B.No, thank you.
（5）A.He’s writing a letter. 
B.She’s playing with a toy.