根据对话情景，填入适当的单词 A: Excuse me. Could you help me?
B: {#blank#}1{#/blank#} . What can I do for you?
A: Well, I'd like to exchange this CD.
B: What's wrong{#blank#}2{#/blank#} it?
A: My grandson gave it to me as a birthday {#blank#}3{#/blank#} . It's his favorite music, but it's too {#blank#}4{#/blank#} for me. I want something quieter.
B: I'm really sorry, but there are no exchange on CDs after they've been{#blank#}5{#/blank#} .
