past simple and continuous (4)

complete with past simple or past continuous

1. What you (do) when I (ring) you up last week ?
2. As we (walk) in the park yesterday, we (hear) the explosion from the Columbia.
3. While they (lay) the table, we (cut) the bread, so we (be) all very busy before dinner.
5. We didn't (understand) a word of what you said because the water (go) out of the shower.