2 A: I .................. (not/know) you had a dog. B: I .................. (find) her on the street a month ago while I .................. (walk) back from school.

Let's fill in the blanks with the correct form of the verbs in parentheses using either the Past Simple or the Past Continuous tense.

Here's how we can complete the sentences:

1. A: I didn't know you had a dog.
   B: I found her on the street a month ago while I was walking back from school.

Explanation:

• In the first sentence, we use 'didn't know' because it expresses a state or a fact in the past. Since it's a negative statement about what someone knew, the Past Simple 'didn't know' is appropriate.
• In the second sentence, 'found' is used because it describes a completed action in the past. 'Was walking' is used because it describes an action in progress at a particular time in the past.