1) had done, I was playing
2) had come, was having
3)had washed, was watching
4) met, was eating, had bought
5) came, was reading, had brought
6) came, were eating, had cooked
7) rang up, he was still learning, had begun
8) looked, were playing, had brought
9) had settled, were watching
10) came, were cooking, had gathered
11) saw, was sorting, had picked
12) came, saw, had broken, was playing
13) opened, saw, teacher had already come, were writing
Можно было 4-5, но 13 лучше) пиши, если чо не так!)