A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main idea of the writing process. It shows that the first draft is done, but more work is needed. This is an overview of what comes next. It does not refer to anything before it, so it is independent. 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 main topic. "You can revise individual paragraphs as you finish them as well" refers to revising, but does not start the discussion. "The next step is to revise your paper – strengthen the content" assumes that the reader knows what step is being talked about. "In fact, you don’t need to wait until you have a complete first draft to start revising" also assumes prior knowledge.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the ideas about revising. It shows that revising can happen at any time, which is a good conclusion to the writing process.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it follows the idea of finishing the first draft. The phrase 'the next step' shows a logical order of actions in the writing process.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it gives advice on when to start revising. The word 'start' shows a clear action that follows the revision step.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it explains that you can start revising early. The phrase 'in fact' shows that it adds more information about starting the revision process.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it gives more details on how to revise. The phrase 'as you finish them' shows that revising can happen at different times.