Answer:
4-1-3-2
Explanation:
This is the most logical order for these sentences. In these lines, we learn the story of a person who is waiting for a letter. We learn that the person sees the mailman outside, and the mailbox open and close. When he hears this, the person rushes downstairs, opens the door and goes outside. He eventually gets to the mailbox, nervous as he thinks of the importance of this letter that could decide his whole future.