Simple past or Past continuous?1 When I (do) the washing-up, I

Simple past or Past continuous?
1 When I (do) the washing-up, I (drop) a plate.
2 While Tom (play) the piano, his mother (do) the washing-up.
3He (drink) some juice and then he (eat) a few chips.
4I (have) dinner when I suddenly (hear) a loud bang.
5When my father (work) in the garden, an old friend (pass) by to see him.
6She r (go) to school, (take) out her textbook and (begin) to learn.
7When it (start) to rain, our dog (want) to come inside.
8When Jane (do) a language course in Ireland, she (visit) Blarney Castle.
9When I (be) on my way home, I (see) an accident.
10 I (not understand) what they (talk) about.