A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first because it introduces the main topic about the internet's role in our lives. It sets the stage for the discussion. It does not refer to any previous information, which makes it independent. It uses a broad overview to explain the importance of the internet. Why other lines are not chosen? Paragraph 2 starts with "The internet" which assumes prior knowledge. Paragraph 3 starts with "With the rise" which also needs context. Paragraph 4 starts with "This has led" which refers back to something not yet mentioned.

Concluding sentence: Why this is the last line? This paragraph is the last because it wraps up the discussion. It summarizes the effects of the internet and social media on knowledge sharing. It brings together the main points made in the earlier paragraphs.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it explains how the internet has changed our lives. It follows the logical order of discussing the role of the internet and then explaining its benefits.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it gives a specific example of how the internet helps people communicate. This is a broader to specific strategy, moving from general benefits to a specific platform.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it shows the result of sharing on social media. It explains the cause and effect relationship between sharing experiences and the exchange of ideas.