A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it is a general statement about the writing process. It introduces the main topic of revising a paper. It does not use any pronouns or definite articles that refer to previous ideas. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, "Start this at least a week before your paper is due" starts with a command and does not introduce the topic. "You can revise individual paragraphs as you finish them as well" uses a pronoun "you" which refers back to the reader. "Your first draft is complete, but your paper is far from finished" is the only independent sentence.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the ideas about revising. It gives a final thought on how to approach the revision process.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it follows the logical order of the writing process. After finishing the first draft, the next step is to revise the paper.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it gives advice on when to start revising. It shows a logical order of steps in the writing process.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it explains that you can start revising earlier. It shows a cause and effect relationship.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it gives more detail on how to revise. It follows the broader to specific strategy.