A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main event. It tells us about Lindbergh's first flying lesson. This is a clear start to the story. It does not use any words that need earlier sentences for meaning. Why other lines are not chosen? Paragraph 2 starts with "Which" and needs more context. Paragraph 3 starts with "To both" and is not a general statement. Paragraph 4 starts with "During this time" and also needs earlier sentences for context.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up Lindbergh's activities. It gives a final detail about his job as a mechanic. This shows the end of the story about his early flying experiences.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it explains a rule from the academy. The phrase "Which the academy President Ray Page insisted upon" refers back to the flying lesson. This shows a cause and effect relationship.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it shows what Lindbergh did next. The phrase "To both gain some needed flight experience" explains why he left Montana. This shows a logical order of events.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it continues the story of Lindbergh's activities. The phrase "During this time" shows that he was doing both things at once. This is a chronological order.