A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first because it introduces the important step of checking the weather before going on a picnic. It sets the stage for what needs to be done first. It does not refer to any previous information, making it independent. Why other lines are not chosen? Paragraph 2 starts with 'Choosing', which is not independent because it needs context. Paragraph 3 starts with 'Once', which shows it depends on something before it. Paragraph 4 starts with 'Packing', which also needs context from earlier sentences.

Concluding sentence: Why this is the last line? This paragraph is the last because it wraps up the picnic planning by mentioning what to bring for enjoyment. It summarizes the activities and completes the theme of preparing for a picnic.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because after checking the weather, the next step is to choose a good location for the picnic. This shows a logical order of planning.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 because after choosing a location, the next action is to set up a blanket. This shows a clear logical order of actions.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because after setting up the blanket, the next step is to pack snacks and games. This shows a logical order of activities.