Mrs. Black lives on Second Street. New Year is coming. She wants to send 
a card to her friend in Toronto, but she doesn't know where the post office is. She
asks her neighbor  Linda, " Is there a post office near here? I want to send a
card."
"The post office is far from here," says Linda, "but you don't need to go to the
post office to post the card. There is a _ in front of the supermarket. You can
put your card into the mailbox."
Mrs Black and Linda are   _  .
friends sisters mother and daughter neighbors