1.① I ran into a wall when I was looking for a job ② I only had one dollar left in my pocket ③ I scraped by on expired food.

2. Underlined sentences: Finally, I only have one dollar left, but I can't bear to spend it, because it is full of autographs of my favorite singers.

3. The article describes my true love and reluctance for the last dollar, highlights the importance of this dollar to me, describes the difficulty of making this decision, highlights the significance of this decision, and highlights the theme of the article through detailed description.

LZ it seems that your article is incomplete, so I have to search for other people's satisfactory answers.