Complete the sentences with the past perfect form of the verbs in brackets.

1. I didn’t have any chocolate because my sister ______ (eat) it.
2. By the time I arrived at the party, most people ______ (leave).
3. I couldn’t buy the magazine because I ______ (forget) to bring my wallet with me.
4. I didn’t recognise my cousin. He ______ (grow) a beard.
5. After I ______ (do) my homework, I played computer games.
6. We couldn’t get home because we ______ (miss) the last bus.
7. After I ______ (write) the answer, I realised I ______ (make) a mistake.
8. I didn’t watch the programme because I ______ (see) it before.