A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main action of the meeting planning. It sets the stage for what will happen next. It does not refer to any previous information, so it is independent. This follows the rule of Topic Sentence. Why other lines are not chosen? Paragraph 2 starts with 'I sent out', which uses a pronoun 'I' that refers back to a person, so it is not independent. Paragraph 3 starts with 'To conclude', which suggests it is not the beginning but an ending action. Paragraph 4 starts with 'Our discussion', which also uses a pronoun 'Our', making it dependent on previous context.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the meeting. It uses the phrase 'To conclude', which signals the end of the discussion. This follows the rule of Conclusive Words.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it follows the logical order of events. After polling members, the next step is to send out invitations. This shows a clear progression in the planning process.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it describes what happened after the invitations were sent. The discussion is a direct result of the invitations, showing a cause and effect relationship.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it shows the next step after the discussion. After discussing, the group concludes by voting, which follows a logical order.