【题目】  –I’m going downtown to run some errands.

–                                        .

    – Well, the bookstore will be closed by the time I get there.

While you are downtown, could you get me a book of first-class stamps?

While you are downtown, would you please send this letter for me?

While you are downtown, do you think you might be near the bookstore? There’s a paperback book I want to get…