A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of the text. It shows the first step in the process of organizing the exhibition. It does not refer to any previous information, making it independent. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "After selecting" which needs prior context. Paragraph 3 starts with "Logistics" which assumes knowledge of the exhibition process. Paragraph 4 starts with "The exhibition opened" which also needs earlier sentences for context.

Concluding sentence: Why this is the last line? This paragraph is the last line because it concludes the text. It summarizes the outcome of all the previous steps in organizing the exhibition. It uses conclusive words like "marking it as a success," which shows the final result.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it follows the logical order of steps in organizing the exhibition. After reaching out to artists, the next step is to select them, which is shown in Paragraph 2.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it continues the logical order. After finding a venue, the next step is to plan the logistics, which is explained in Paragraph 3.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it shows the result of the planning. After logistics are planned, the exhibition opens, which is the next step.