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 talks about an important feature of modern education. This is a general statement that sets the stage for the rest of the text. It does not refer to any previous information. Why other lines are not chosen? The other paragraphs are not chosen as the first sentence because they do not meet the criteria. For example, Paragraph 2 starts with 'Some people think,' which makes it a specific opinion and not a general statement. Paragraph 3 uses 'In fact,' which shows it is not independent. Paragraph 4 starts with 'It is only when,' which is not a general statement. Paragraph 5 starts with 'His character will only be shaped,' which also makes it specific.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the main ideas of the text. It shows the final point about how important it is to work with others. It reflects the overall theme of cooperation in education.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it gives a viewpoint about cooperation. The phrase 'Some people think' shows a contrast to the idea of cooperation in Paragraph 1. This is a logical order because it presents a concern about cooperation.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it gives a clear answer to the fear mentioned in Paragraph 2. The phrase 'In fact' shows that it is explaining why cooperation is important for personality development.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it explains how working in a group helps develop leadership. The phrase 'It is only when' shows that this is a specific example of how cooperation helps.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it continues the idea of how working with others shapes a person's character. The phrase 'His character will only be shaped' shows that it is another aspect of the same theme.