A、Because she wanted to know ii everything was OK with her parents. B、Because she wanted to invited her parents to Billy’s birth

M: Hello.
W: Hello, Dad?
M: Yes Mary! How are you? Is there anything wrong?
W: Oh, no. I’m just calling to see how you and Mom are. It’s been quite a while since I saw you last.
M: Oh, we’re both fine. Your mother is down at the new shopping center, shopping.
W: For a new dress?
M: No, for shoes this time. How’s Tom?
W: He’s fine. He likes his work and was given a raise last month by Mr. Davis. We were all pretty pleased about that.
M: Yes, and I think you should be. And how are the children?
W: Well, Billy’s home from school today. It’s nothing serious, just a bad cold. And it’s his birthday, too.
M: Oh, I thought his birthday was May 24th.
W: No, the 23rd.
M: Well, that’s too bad. Tell him we sent him a present.
W: All right. Sally’s taking dancing lessons.
M: She must be pretty good by now. I’d like to see her sometime. And how’s Ted?
W: He’s OK. He loves working on cars and has a part-time job at the garage now.
M: Well, it’s certainly good to hear your voice. When are you coming for a visit?
W: Not for a few months, I’m afraid. But I hope we can come for a few weeks this summer, probably in July.
M: That would be nice. Call again soon.
W: OK, Dad. Nice talking to you and glad everything’s all right. Give Mom our love.
M: All right. Goodbye.
W: Goodbye, Dad.