11. We ___ dinner, my brother was doing his homework. a) cooked b) was cooking c) have cooked

Перевод задания: Мы ___ ужин, мой брат делал домашнее задание.

We were cooking dinner, my brother was doing his homework. (Мы готовили ужин, мой брат делал домашнее задание.)

Правильный вариант: b) was cooking, с согласованием подлежащего we — were cooking. Past Continuous описывает действия, происходившие одновременно в прошлом.