A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the town of Liberal. It gives a general idea about the town without needing other sentences for context. It does not use any pronouns or definite articles that refer to previous ideas. This makes it a clear topic sentence. Why other lines are not chosen? Paragraph 2 starts with 'Liberal is...' which uses a definite article and assumes prior knowledge. Paragraph 3 starts with 'This should make...' which refers back to something not yet mentioned. Paragraph 4 starts with 'Liberal’s mayor...' which uses a possessive pronoun. Paragraph 5 starts with 'Mr. Denoyer voted...' which also assumes prior knowledge.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the discussion about Mr. Denoyer. It gives a final thought on his political choice and reflects on the overall theme of the town's political landscape.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 continues from Paragraph 1 by providing more information about the town of Liberal. This shows a logical order where the first paragraph introduces the town and the second paragraph gives details about its characteristics.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 by discussing the political situation in Liberal. The information about the town's changing demographics leads to the idea that it should be receptive to Democrats, showing a cause and effect relationship.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 follows Paragraph 3 by introducing the mayor of Liberal. This shows a logical order where the political context leads to information about the mayor, who is a key figure in the town.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 by discussing the mayor's political choice. This shows a logical order where the background of the mayor leads to his voting decision, highlighting a contrast in his upbringing and his choice.