根据对话情景，填入适当的单词（每空一词，每词一分，共5分）
A: Excuse me. Could you help me?
B:       . What can I do for you?
A: Well, I’d like to exchange this CD.
B: What’s wrong       It?
A: My grandson gave it to me as a birthday       . It’s his favorite music… but it’s too        for me. I want something quieter.
B: I’m really sorry, but there are no exchange on CDs after they’ve been      .