—- ______. We still have fifteen minutes before the show begins.

根据对话的情景，从方框中选择适当的句子填在画线处，使对话完整通顺。其中有两项是多余的。
A: Hi, Zhou Yanhong. {#blank#}1{#/blank#} 
B: I'm reading a book.
A: Oh, do you like reading?
B: Yes, very much. _{#blank#}2{#/blank#} 
A: I like playing the piano.
B: Good. By the way,{#blank#}3{#/blank#} 
A: It's easy and interesting. I like it a lot.
B: But I think it's difficult and boring. {#blank#}4{#/blank#} I like Chinese best.
A: {#blank#}5{#/blank#} 
B:Because I think it's useful (有用的) and interesting.

 _________. They are exchange students of  No. 1 Middle School.

—Sorry, Dad. I didn't get good grades this time.