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 internet's importance in our lives. It gives a broad overview without going into details. It does not use any pronouns or definite articles that would need prior context. Why other lines are not chosen? Paragraph 2 starts with 'It', which is a pronoun that refers back to something else. Paragraph 3 starts with 'The internet', which uses the definite article 'the' and assumes prior knowledge. Paragraph 4 starts with 'This innovation', which also uses a pronoun that refers back to something else.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the main ideas. It summarizes the overall impact of the internet on communication and work, showing the final effect of the previous points.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the idea of the internet's impact. The phrase 'It has transformed industries' shows how the internet affects different areas of life. This is a logical order.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it gives more examples of how the internet changes things. The phrase 'also opened up new opportunities' shows that it adds to the previous point about transformation.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it explains the effects of the opportunities mentioned. The phrase 'This innovation has revolutionized' shows how these opportunities change communication and work.