Work in pairs: decide which is the correct tense. Past Simple or Past Continuous? d) We went/were going to the city. But on the way we heard/were…

Work in pairs: decide which is the correct tense. Past Simple or Past Continuous? d) We went/were going to the city. But on the way we heard/were hearing about a bomb scare. So we drove/were driving back home. e) I walked/was walking in the street when I suddenly heard/was hearing someone call me.