Use the verbs in brackets in the past perfect

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Exercise 1. Use the verbs in brackets in the past perfect.
1. Why did Tom's mother get angry with him?
Because he (break) her favourite vase.
2. When did you watch TV last night?
When I (do) all my homework.
3. Did you first see them at my last birthday party?
No, I (meet) them before.
4. Why did she return home?
She suddenly remembered she (not turn off) the gas stove.
5. How did they like our city?
They said it was the loveliest city they ever (see).
6. It rained yesterday after it (be) dry for months.
7. By the time he arrived, all his classmates (leave).