Answer:
1. I almost missed my flight since there was a long queue in the duty-free shop.
2. Even though they're expensive, they last forever and never go out of style.
3. Although she is young, she is very independent.
4. Before I met the Gills, I had been gardening for nearly ten years.
5. After he had finished his studies, he went to America.
6. She went back to live with her mother because she did not earn enough money to live in her own house.
7. When they were driving to Dallas, they caught an accident.
8. While she was asleep, thieves broke in and stole her handbag.
Hope this helps!