293. myself, yourself, himself, herself, ourselves, yourselves или themselves?

1. I cleaned the windows myself.
2. Linda has to cook lunch.
3. Bob made the salad himself.
4. Bob and Andrew made the salad themselves.
5. Sally, look at herself.
6. Sally looked at herself.
7. Sam looked at himself.
8. We will have to buy the tickets ourselves.
9. The cat lay under the table, washing itself.
10. Mary, have you hurt yourself?
11. Mary has hurt herself.
12. Children, do you think you can move the bookcase by yourselves?