填入恰当的词，使对话完整、通顺。 A: Good morning. Can I help you? B: Yes, please. I bought this radio the day before yesterday, 1_____ there's something wrong with it. Last night it couldn't 2_____. I can' t use it. A: Let me see. It seems as if it hasn't been used in the right way. Has it been left in the sun 3_____ rain? B: Of course 4_____. I can't be so foolish. A: Maybe I have to send it 5_____ to the factory and get it repaired. B: You may send it back to the factory, but I would like my 6_____ back. A: I'm 7_____ I can't do that. B: How long do I have to wait 8_____ I can get it back? A: At least a month, I think. B: That's too long. I'm learning English over the radio, you know. Why don't you do something about it? I'd like to 9_____ this radio or have my money back. A: AIl right. You can change it for 10_____ one. Would you like to look at these ones?