(1)① shopping mall ② post office ③ school ④ bookstore ⑤ children's park;

As shown in the figure,

(3)( 1000-300+500)×2

= 1200×2

=2400 meters

A: Xiao Juan has to walk 2,400 meters from going to school after lunch to coming home from school in the afternoon.

So the answer is: shopping malls, post offices, schools, bookstores, children's parks.