A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main idea about students applying or recalling knowledge. It sets the stage for what students do when they learn or take exams. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with 'Students will also think...' which uses 'also' and needs prior context. Paragraph 3 starts with 'Teachers will host...' which is specific and does not introduce a new idea. Paragraph 4 starts with 'By doing so...' which refers back to something not mentioned yet.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the ideas. It shows the outcome of the previous actions and gives a final thought on how students can reflect on their learning.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the idea of how students use knowledge. It shows a logical order of thought about knowledge application.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 because it introduces a new action by teachers. This shows a logical order where teachers help students discuss their thoughts.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it explains the result of the online sessions. It shows how students can engage more with the information.