Final answer:
Paragraphs 13 and 14 contrast Duck's optimistic actions with the skepticism of his peers, thereby adding tension to the plot.
Step-by-step explanation:
Paragraphs 13 and 14 add tension to the plot by contrasting Duck's optimism with the other workers' skepticism. Ducks is setting out containers to catch rain, a rain he believes has healing properties, despite the clear skies, indicating his optimism. Meanwhile, the other characters are betting against the rain, demonstrating their skepticism. This contrast in beliefs about the rain heightens the tension as readers are left wondering which outcome will occur.