First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of dealing with bugs when the landlord does not help. It sets up the problem without going into details. It does not use any words that need prior context. Why other lines are not chosen? Paragraph 2 starts with "You can report" which is not general and needs context. Paragraph 3 starts with "Alternatively" which shows it is not the first. Paragraph 4 starts with "This proactive approach" which also needs earlier information.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the ideas by showing the result of taking action. It summarizes the benefits of being proactive in dealing with pest issues.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it gives a specific step to take when dealing with the problem mentioned in Paragraph 1. This shows a logical order from a general problem to a specific solution.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it offers another option for tenants. The word "Alternatively" shows that it is a different choice after the previous solution.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it explains the benefit of taking action by yourself. The phrase "This proactive approach" refers back to the actions mentioned in Paragraph 3.