A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic. It tells us that schools have different ways to inform parents. This is a broad overview of the subject. It does not use any pronouns or definite articles that need prior context. Why other lines are not chosen? Paragraph 2 starts with "One of the common ways" which refers back to the main topic, so it is not independent. Paragraph 3 starts with "These are times" which also refers back to previous ideas. Paragraph 4 starts with "Open days" but it is not general enough to stand alone.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it summarizes the benefits of open days. It wraps up the main ideas by showing what parents can gain from these events.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it uses the phrase "One of the common ways". This shows a logical order from a general statement about informing parents to a specific example of open days.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it explains more about open days. It shows a logical order by giving more details about what happens during open days.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it explains the benefits of open days. It shows a logical order by discussing what parents can learn during these times.