Past Continuous vs Past Simple exercise - answers

When the war broke out we were living in Warsaw. (break / live)
It was beginning to rain when we started. (begin / start)
While I was listening to the concert somebody knocked at the door. (listen / knock)
When they were living in that house she was very ill. (live / be)
We just were waiting for Mary when John came. (wait / come)
They were drinking wine every day when they were in France. (drink / be)
She was driving very quickly when the accident happened. (drive / happened)
We were having dinner when he arrived. (have / arrive)
They were playing tennis when we got there. (play / get)
She was wearing a pink summer frock when I met her yesterday. (wear / meet)
The telephone rang while I was having my bath. (ring / have)
My son hurt his knee badly when he was riding his bicycle yesterday. (hurt / ride)
While the scientist was working in his laboratory a friend came to see him. (work / come)
When the farmer was sowing wheat he saw many airplanes in the sky. (sow / see)
At half past nine she still was doing her homework. (do)