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 report. It gives a broad overview of important causes of death for young people. It does not need any other sentence for context. Why other lines are not chosen? Paragraph 2 starts with "Other injury-related killers" which needs context from the first paragraph. Paragraph 3 starts with "But these" which is a conjunction and needs a previous idea. Paragraph 4 starts with "For example" which shows it is giving an example and needs a main idea first. Paragraph 5 starts with "In Vietnam" which also needs context from earlier sentences.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion on interventions. It shows a specific action that helps reduce deaths, which concludes the topic of how to prevent injuries.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the topic of causes of death. It lists more types of injuries that also cause death. This shows a logical order of discussing different causes.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it talks about how to reduce these deaths. The word "But" shows a contrast, meaning there are ways to help despite the dangers mentioned in Paragraph 2.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it gives a specific example of an intervention. The phrase "For example" shows that it is explaining one way to help improve safety.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it gives another example of an intervention. It shows a different way to reduce deaths, this time focusing on swimming training.