Помогите, пожалуйста, с заданием по английскому языку. Past Perfect

1. Had forgotten
2. Had gone
3. Had just had
4. Had left
5. Hadn’t phoned
6. Had come back
7. Had met
8. Had often heard, had never seen
9. Had given up, had made
10. Had already bought
11. Had arranged
12. Had sold
13. Had finished