I was seeing/saw a friendly dog while i was walking/walked to work today. Circie the correct item.

I was seeing/saw a friendly dog while I was walking/walked to work today.

I saw a friendly dog while I was walking to work today. Я видел дружелюбную собаку, пока я шел на работу сегодня. Saw – past simple tense (простое прошедшее время); was walking – past continuous tense (прошедшее длительное время).