A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic about working parents and their kids. It does not need any other sentence for context. It is a general statement that sets the stage for the following sentences. Why other lines are not choosen? Paragraph 2 starts with 'Some schools' which needs context. Paragraph 3 starts with 'These schools' which also needs context. Paragraph 4 starts with 'And they' which is not independent. Paragraph 5 starts with 'This' which refers back to something else.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the main idea. It shows the result of the previous sentences about after-school services and fees.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the idea of schools. It shows what some schools offer after parents drop off their kids.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it gives more details about the after-school services. It explains what activities these schools conduct.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it explains that there are fees for the activities mentioned. It shows a cause and effect relationship.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it explains the benefit of the fees. It shows how charging fees helps parents.