5. Yesterday from 7 till 9 Peter (walk) his dog in the park.

Ответ (RU):

5. Yesterday from 7 till 9 Peter (walk) his dog in the park.

1. Yesterday from 7 till 9 Peter <strong>was walking</strong> his dog in the park.

В данном предложении нужно использовать Past Continuous, так как действие продолжалось в течение определенного периода времени в прошлом (from 7 till 9).

<strong>Ответ:</strong> was walking