помогите пожалуйста!!! 3. Use the Past Simple or Past Continuous.

1.When he___(arrive) we____(have) a picnic. 2. I____(run) up the stairs when i___(hear) the scream. 3. They____(drive) home when the car___(hit) a tree. 4. When they____(get) married, they _____(work) in Japan.​​