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Past simple or Past perfect?
1. I (finished / had finished) writing the project at 6 o'clock yesterday.
2. I (wrote / had written) the composition by 6 o'clock yesterday.
3. The teacher (understood / had understood) that the pupils (did not / had not done) their homework.
4. Lucy (threw / had throw) away the letter which Peter (sent / had sent) to her.
5. I (tell / had told) my mum about the marks which I (got / had got) at school
6. He said he (was / had been) there twice.
7. When I (came / had come) to her, she (already went / had already left).