A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of advertisements. It gives a broad overview of what advertisements do. 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 'It is hardly possible', which is not independent. Paragraph 3 starts with 'Supposing you wanted', which also needs context. Paragraph 4 starts with 'Lots of people pretend', which is not a general statement.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the discussion about advertisements. It gives a strong conclusion about how we cannot avoid them. This follows the Conclusive Words rule.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it gives an example of how advertisements help us. This follows the Broader to Specific Strategy. The first paragraph talks about advertisements in general, and the second paragraph gives a specific case.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it discusses people's views on advertisements. This follows the Logical Order rule. The second paragraph gives an example of how advertisements are used, and the third paragraph talks about people's opinions on reading them.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it gives a strong statement about advertisements. This follows the Cause and Effect Relationship rule. The third paragraph doubts the claim of not reading ads, and the fourth paragraph states that it is almost impossible to avoid them.