Choose the correct option.

1. They were friends but they blamed themselves / each other for what had happened.
2. Paula, stop talking about yourself / yourselves. Let the others say something about them / themselves.
3. The policeman collected all the evidence by him / himself.
4. They were all involved in that robbery but in court they thought only about themselves / each other.
5. The police found a new witness of that crime and interviewed herself / her.
6. Fortunately, they didn't punish us / ourselves.