The Past Continuous and the Past Simple

We ... (sit) down when the concert ... (start).

I ... (choose) a present for my friend when she ... (come into) the shop.

Emily ... (talk to) Lisa when the train ... (arrive).

When Mary ... (look for) some sweets, she ... (find) her phone.

The boys ... (train) when Tom ... (have) an accident.

When we ... (walk) on the hillside some stones ... (fall) from the cliff.

The artists ... (perform) on stage when the audience ... (start to) laugh.

The bag ... (break) when I ... (carry) the shopping to the car.

When we ... (shop), it ... (start to) snow.

My brother and I ... (cycle) in the forest when he suddenly ... (fall) over.