Past continuous for interrupted actions

I ____ a book when the doorbell rang.

• read

• was reading

• was read

• reading

They ____ football in the park when it started to rain.

• playing

• were playing

• was playing

• play

She ____ dinner when her friend arrived.

• cook

• were cooking

• was cooking

• was cook

We ____ for the test when the power went out.

• were studying

• was studying

• study

• studying

He ____ a movie when his phone rang.

• watching

• were watching

• watch

• was watching

Susan ____ a picture when she accidentally spilled some paint on the floor.

• were paint

• paint

• was painting

• painting