Here is the solution:
1. Were you shopping at 1 p.m., Sarah? - f: Yes, I was.
2. Were the crew filming in the park yesterday? - d: Yes, they were.
3. Was Dad watching a DVD at eight o’clock? - c: No, he wasn’t. He was reading.
4. Was Mum drinking tea at four o’clock? - b: Yes, she was.
5. Were you two sitting here a minute ago? - a: No, we weren’t. We were over there.
6. Was I talking to your grandma? - e: No, you weren’t. It was my aunt.