Past perfect simple and continuous 1

1. By the time I got to the party John ____________.
   1.   ?    had left
   2.   ?    had been leaving
2. I had to have a break. I ____________ so long.
   1.   ?    had been driving
   2.   ?    had drove
3. He ____________ the task by the time he went home.
   1.   ?    had completed
   2.   ?    had been completing
4. They ____________ all morning before they ran out of (to use all of something and not have any left) paint and went to buy more.
   1.   ?    had been painting
   2.   ?    had painted
5. She ____________ the English Channel every summer until 1997.
   1.   ?    had swum
   2.   ?    had been swimming
6. She ____________ for over an hour so she was very hot and sweaty.
   1.   ?    had been running
   2.   ?    had run
7. They ____________ for several years before they got engaged.
   1.   ?    had been dating
   2.   ?    had dated
8. She ____________ the movie before but wanted to see it again.
   1.   ?    had watched
   2.   ?    had been watching
9. He ____________ all week so decided to take some time off.
   1.   ?    had been studying
   2.   ?    had studied
10. Hemingway __________ his self-confidence for years before the publication of Old Man and the Sea.
    1.   ?    had been losing
    2.   ?    had lost