Past simple - past continuous

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I lost my keys when I ________ (walk) home.

I lost my keys when I was walking home.

I saw the department stores when I ________ (sit) on the bus.

I saw the department stores when I was sitting on the bus.

When I _____ (study) in my room, my roommates ____ (come)

While I was studying in my room, my roommates came.

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