Помогите пожалуйста,нужно вставить was или were 1)I______crossing the red light when

Помогите пожалуйста,нужно воткнуть was либо were
1)I______crossing the red light when accident took place.
2)You_____very busy on Monday.
3)I_____so happy yesterday/
4)They____working on their chemisty project.
5)Did She say what she_____doing.
re7)We____at school last Sunday/
8)Where____they playing.
9)Reena and Meena____late for shool.