A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first because it introduces the main topic of South Africa's capital cities. It gives a broad overview without going into details. It does not use any words that need prior context. Why other lines are not chosen? Paragraph 2 starts with "Here," which needs context. Paragraph 3 starts with "Jacaranda trees," which is specific and does not introduce the main topic. Paragraph 4 starts with "It was founded," which also needs context. Paragraph 5 starts with "Church Square," which is too specific to be the first sentence.

Concluding sentence: Why this is the last line? This paragraph is the last because it wraps up the information about Church Square. It gives a final detail about its location and importance, which concludes the discussion.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it gives more information about one of the capitals. It follows a logical order where the first paragraph introduces the capitals and the second talks about the founding of one of them.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it continues the topic of the city. It describes the city and mentions a famous place in it. This shows a broader to specific strategy.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it shifts the focus to an important event in the city. The mention of Church Square in Paragraph 3 leads to the historical event in Paragraph 4.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it gives more information about Church Square, which was mentioned in the previous paragraph. This shows a logical order where the event leads to a description of the location.