Вычислите объем кислорода (н.у) затраченный на сжигание пропилена 30л

1)they dined when their father came.

2)mike phoned me at the time i was sleeping.

3)  i met tom when he went home.

4) i have seen an accident on the road while driving to school.

5) the children played at a time when my mother was preparing dinner.

6) where are you going when i met you?

7) she dropped a plate at a time when washing dishes.

8) he wrote a letter when the phone rang.