Put the verbs in brackets into the correct past tense.
1) Yuri ..... (work) on his computer for two hours before it .... (break down).
2) I ..... (mop) the floor while my brother was cutting the grass.
3) ..... (you/sleep) when the earthquake ..... (start)?
4) This time last week, I ..... (fly) to Paris.
5) Sam was really happy because he ..... (pass) all his exams.
6) Sarah ..... (clean) the house by the time her barents ..... (come) back.
7) James ..... (wait) for a while and then ..... (open) the door to see who ..... (make) that strange noise.
8) Marion ..... (not/go) shopping because she ..... (spend) the morning with her little brother that day.