aidé moi svpp je n'arrive pas

prétérit simple ou progressif
Complete with the simple past or past continuous :
1. I was walking when I ?????(see) him yesterday.
2. My mother was cooking when my father ?????? (come) Black.
3. What ????? you ( do) when I ?????? (meet) you?
4. When I ????? (be) a child I ????? (cry) all the time.
5. I ????? (have) a shower yesterday when you ????? (call) me.
6. Matt ????? (phone) while we ????? (watch) the match on television.
7. I ?????? (explain) the exercise to him when Liverpool ????? (score) a splendid goal.​