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?