1. What was the name of the person that bought your old car?
2. All the doors were open, which seemed rather old.
3. I’ll stay here till six, by that time Jane should have phoned.
4. Whatever you do, don’t press this red button.
5. This is the school which I used to go to.
6. As he was driving carelessly, the police arrested David.
7. It seemed odd that you should be here on holiday too.
8. This is Sophia, who is taking over my job when I leave.
9. On the Sunday, that was my birthday, we went out for a meal.
10. The success of a shared holiday depends on who/whom you share it with. Оба варианта используются.