giải giúp ạ

1. You had been working there for more than two hours when she finally arrived. 2. She did various sports for a long time so she was very fit. 3. She didn't sit at home for long before she went out. 4. Mary hadn't waited long when he turned up. 5. We traveled all day before we got to Madrid. 6. Tina trained guide dogs for a long time before she changed her job. 7. When the student revolution came, I worked there for 6 months. 8. When the doctor told him his liver was seriously bad, he stopped eating hamburgers for a month. 9. Prior to the explosion, the fat man had eaten seven large chocolate cakes.