听力原文：W: You look worried, David. Anything wrong with you? M: Oh, it's nothing really. W: Arc you sure? Would you like to talk about it? M: Well, to be honest, it's.., it's my mother. She... she.., how shall I put it? She has been behaving strangely lately. Do you know what I mean? W: Not quite. How? In what way? M: Well, you see, ever since my father died, she has been unhappy even though. W: But that is normal, isn't it? People are always upset about things like that. M: Yes, yes. Of course, they are. But they never got on that well when he was alive. Always arguing. And it happened more than three years ago. I never thought that she would miss him so much. W: Oh, I see what you mean. M: It wouldn't be so bad if she didn't live so far away. When my father retired, they moved to the seaside. Then only a year later, my father suddenly had a heart attack and just passed away. Now she's all alone in a big cottage by the sea with very few friends and no family near. her. W: She must be very lonely. M: Yes, she is. My wife and I go to see her as often as we can. But it isn't easy. I phone her at least twice a week and ask her if she is all right or if she needs something... And that is something else that worries me. W: What? M: Her memory seems to be going. I have to remind her to do all sorts of things.., to pay the gas bill, for instance. She gets annoyed with me. But I know she'll forget if 1 don't. W: Well, don't worry about it too much. She's just getting old, that's all. M: I know. That's just the problem. (27)