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Краткий ответ:

1. I went to the gym and I had just arrived home when Michael called me. He said he had been trying to call me for ten minutes before I finally answered the phone.
2. I had been sitting in the boat for two hours when I caught a huge fish.
3. The concert had just started when suddenly it began to rain. The musicians had only been playing for ten minutes.
4. The children had dusted the furniture and they had put away all of their toys.
5. I had been cleaning the house for hours when the children came in with muddy shoes.
6. I had been waiting for the train for over an hour before it eventually arrived.

Как выбрать время:

• Past Perfect: had + V3 — действие завершилось до другого момента в прошлом.
  Например: had just arrived, had started, had dusted, had put away.
• Past Perfect Continuous: had been + V-ing — действие длилось некоторое время до другого события.
  Подсказки: for two hours, for ten minutes, for hours, for over an hour.

В № 4 используется Past Perfect, потому что подчёркивается результат: дом был убран.