A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces Ne Tan and her current study program. It gives a clear overview of what she is doing now. This follows the rule of Topic Sentence, as it sets up the main topic without going into details. Why other lines are not chosen? Paragraph 2 is not chosen because it starts with a specific detail about Ne's past and does not introduce the main topic. Paragraph 3 is not chosen because it talks about her diploma, which is not the main focus. Paragraph 4 is not chosen because it describes her current year of study but does not introduce her or the program.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up Ne's story by explaining her current study plan and future return. It uses conclusive words like 'now' and gives a summary of her current situation, which follows the Summary Style rule.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it gives more background about Ne Tan. This follows the Broader to Specific Strategy, as it starts with a general statement about her current study and then provides specific details about her background.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it continues to explain what Ne did at Monash College. This follows the Logical Order rule, as it shows the next step in her journey after starting at Monash College.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it shows what happened after Ne completed her diploma. This follows the Chronological Order rule, as it describes her current situation after finishing her diploma.