Were they listening to the news on the radio when the telephone rang?
Who was listening to the news on the radio when the telephone rang?
What were they listening to on the radio when the telephone rang?
When were they listening to the news on the radio?
What were they doing when the telephone rang?
Were they listening to the news or to the music on the radio when the telephone rang?
They were listening to the news on the radio when the telephone rang, weren't they?