Краткое пояснение: Необходимо сопоставить причины и следствия, используя грамматическую конструкцию past simple и союз "so" (поэтому).
Решение:
- 1. Kelly was tired, so she couldn't water the plants.
- 2. Harry had a toothache, so he couldn't eat.
- 3. The supermarket wasn't open, so Jim couldn't go shopping.
- 4. Isabel was ill, so she couldn't go to school.