Past perfect simple and continuous 2

1. __________ long before the taxi arrived?
   1.   ?    Had you been waiting
   2.   ?    Had you wanted
2. We __________ to open the door for five minutes when Jane found her key.
   1.   ?    had been trying
   2.   ?    had tried
3. After they __________ the good news they burst into laughter.
   1.   ?    had heard
   2.   ?    had been hearing
4. After Sofie __________ her work, she went to lunch.
   1.   ?    had finished
   2.   ?    had been finishing
5. After the company __________ Joe, he began to work on his first project.
   1.   ?    had hired
   2.   ?    had been hiring
6. I __________ my document before the computer crashed.
   1.   ?    had saved
   2.   ?    had been saving
7. When Tommy finally came the girls __________ for a few hours.
   1.   ?    had been singing
   2.   ?    had sung
8. By the time they left town the mechanic __________ the car.
   1.   ?    had repaired
   2.   ?    had been repairing
9. It seemed like somebody __________ a cake.
   1.   ?    had been cooking
   2.   ?    had cooked
10. It __________ so quickly, I didn't notice.
    1.   ?    had happened
    2.   ?    had been happening