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 text, which is about preparing a traditional British Sunday roast. It does not refer to any previous information and gives a broad overview of what is to come. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs are not chosen because they do not meet the criteria for being independent. For example, Paragraph 2 starts with "Once the meat is in the oven," which needs context from a previous sentence. Paragraph 3 starts with "The key to perfect Yorkshire puddings," which also refers back to a specific topic. Paragraph 4 starts with "For the vegetables," which is not a general statement. Paragraph 5 starts with "Finally," which indicates it is not the first sentence.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the cooking process. It uses the word "Finally," which signals that this is the conclusion of the text. It brings together all the earlier points about preparing the roast and serving it.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 logically connects with Paragraph 1 because it follows the logical order of cooking. After selecting the meat, the next step is to put it in the oven and focus on side dishes.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it provides specific details about one of the side dishes mentioned in Paragraph 2. This follows the Broader to Specific Strategy.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it continues the topic of side dishes. It provides more details about another side dish, which is vegetables. This follows the Logical Order.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it concludes the cooking process by discussing how to serve the roast. This follows the Cause and Effect Relationship, as serving the roast with gravy is the final step after preparing the vegetables.