Complete the sentences using past simple or past continuous.

We were having breakfast when the telephone rang.
She met a lot of friendly people while she was working in Russia.
When they left the gallery, the sun was shining.
The students were laughing when the professor came in.
While the children were sleeping, their parents were watching TV.
It started to snow while she was coming back from the opera.
When Pete opened the door, it was raining.
While Evgeny was sunbathing, his wife was swimming in the sea.
She heard a loud bang while she was talking to her friend.
While he was taking a shower, his cats were eating his steaks.
When I was texting, the school bus arrived.
Ilya broke his leg while he was skateboarding.
He wasn't listening to music while he was cooking breakfast.
My sister was driving at 120 km/h when a policeman stopped her.
The boy noticed that a girl was watching him.
My granddad fell off the ladder while he was painting the ceiling.
While they were waiting, they were surfing the net.
Tim became sick while he was travelling in China.
What were you doing when you heard about the accident?
My sister said that she didn't feel happy, so I talked to her.