Review past continuous.
The baker was ____ ( bake) cakes when I _____ ( walk) in.
The baker was baking cakes when I walked in.
When I ____ ( meet) the artist, he was ____ ( paint) a picture.
When I met the artist, he was painting a picture.
When the photographer ____ ( take) the photo, the nurses were ____ ( talk).
When the photographer took the photo, the nurses were talking.