Put the following sentences into the passive voice: 1. we heat the house by gas. 3. people may keep books from the library for a fortnight. after that they must return them. 5. everyone expected him to pass his exams well. 7. we shall throw out the mushrooms if they are poisonous. 9. nobody had warned me

The house is heated by gas. Books may be kept from the library for a fortnight. They must be returned after that. He was expected that all his exams would be passed well. The mushrooms shall be out is they are poisonous. I had not been warned