ANSWERS
1. b) She went to the store before I called her.
2. a) He had bought a new car every year.
3. c) were waiting
4. d) had, eaten
5. d) By the time we reached the airport, the flight had already taken off.
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6. a) She was reading a book while her brother played outside.
7. a) had
8. a) were driving
9. b) After I finished my work, I went for a walk.
10. a) They have been studying for the exam for three hours.