Ответ:

Раскрываю скобки:

1/ played / had had

2/ had harvested / took

3/ had stopped / could

4/had swallowed / began

5/ became / had worked

6/ jumped / had unpacked

7/ had sold / moved

8/ worked / had finished

9/ had called / called

10/ left / had ended

Объяснение:

Два действия в прошлом. Более раннее выражается Past Perfect. Более позднее - Past Simple