M: Hi, Doris. I hear you are going to the United States next week.

W: So I am.

M: When did you get your passport?

W: I got it last week.

M: How long is it valid?

W: It's valid for 5 years. I am planning to do a doctor’s degree during my stay there.

M: Good. Good luck to you!

W: Thank you very much.
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