A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of the text, which is the conference. It gives a broad overview of what will happen and when. It does not need any other sentence for context. Why other lines are not chosen? Paragraph 2 starts with "The conference" which refers back to the conference, so it is not independent. Paragraph 3 starts with "Students" which does not stand alone. Paragraph 4 starts with "It is important" 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 text by giving a final important point. It emphasizes the need to register, which is a conclusion to the information given about the conference.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it uses the connector "The conference" to refer back to the conference mentioned in Paragraph 1. This shows a logical order of ideas.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it continues the topic of assistance. It explains what students can do with the help from the campaign mentioned in Paragraph 2. This shows a logical order of ideas.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it talks about the next step for students. After speaking with professionals, it is important to register for sessions. This shows a logical order of ideas.