A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of the text. It gives a broad overview of how the internet has changed our lives. 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, 'Furthermore, the internet...' starts with a conjunction, so it cannot be the first sentence. 'Moreover, it has...' also starts with a conjunction. 'Additionally, it has...' starts with a conjunction too. All these sentences need a previous sentence for context.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion about the internet's impact. It gives a final point about how the internet helps in education and self-improvement. This follows the rule of Summary Style.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the discussion about the internet. The word 'Furthermore' shows that it adds more information about the internet's impact. This follows the Connector Strategy.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it adds another point about the internet. The word 'Moreover' shows that it gives more details about the changes caused by the internet. This follows the Connector Strategy.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it continues to explain the benefits of the internet. The word 'Additionally' shows that it adds another important point. This follows the Connector Strategy.