Test: Past Progressive (Intensivtrainer)

Complete with the Past Continuous / Progressive.
For example: 
I was writing letters all day yesterday. (write)

Fil in the gaps with the past simple or past continuous.
Example:
I saw (see) him, when he was riding (ride) a bike.

Fil in the gaps with the past simple or past continuous.
Example:
I saw (see) him, when he was riding (ride) a bike.