Answers:

2. I couldn't pay because I had left my money at home.

3. I didn't do very well in the test because I hadn't studied last night.

4. I went to France last year. It was the first time I had visited another country.

5. There wasn't any ice cream left because my brother and sister had eaten it all.

6. The shop wouldn't  change the shirt I bought because I had lost the receipt.

7. We couldn't buy anymore film  for our camera because the shops had shut.

8. You looked bored in the cinema, you had seen the movie before?