1. The rule is given by the authors on the first page.
2. A new lock has been bought by my parents.
3. The telephone was invented by Alexander Bell.
4. A tasty lunch had been cooked by my mother before I came home.
5. The town was destroyed by the hurricane last year.
6. This article will be translated by them tomorrow.
7. Her face was hidden by the branches of the tree.
8. Some new metro lines are being constructed (by them).
9. Russian isn't spoken in English classes.
10. They haven't been given any money yet.
