听第4段材料，回答第10至12题。
W: What are you doing, Tom?
M: I'm writing to my mother.
W: But you wrote to her only yesterday.
M: Yes, but I have something new to tell her.
W: Something new?
M: Yes. I am telling her I've decided to take up a part-time job as a shop assistant.
W: What do you mean? You've been working at one for nearly three months. Have you been fired by Rogers?
M: No, my mother doesn't know I have a part-time job.
W: You mean, you didn't tell her before?
M: No. I didn't want her to worry about my study.
W: But why are you telling her now?
M: Now I don't want her to worry about my life here. You see, I told her that I'd just bought a car in my last letter.

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