First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic. It talks about how fashion and tastes change over time. This is a general statement that does not need other sentences for context. It does not use any pronouns or definite articles that refer to previous ideas. Why other lines are not chosen? Paragraph 2 starts with 'Such changes', which refers back to the first sentence, so it is not independent. Paragraph 3 starts with 'Changes in work patterns', which is specific and does not introduce a new idea. Paragraph 4 starts with 'Consequently', which shows a result and needs a previous idea. Paragraph 5 starts with 'In contrast', which also needs a previous idea to make sense.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the ideas presented in the previous paragraphs. It shows a new trend in shopping and relaxing, which concludes the discussion about changes in people's habits.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it explains the effect of the changes mentioned in Paragraph 1. This follows the 'Logical Order' rule.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it gives a specific example of how changes affect family meals. This follows the 'Broader to Specific Strategy' rule.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it shows the result of the changes in family meals. This follows the 'Cause and Effect Relationship' rule.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it contrasts the idea of buying convenience food with spending time shopping. This follows the 'Contrast' rule.