Rewrite the active sentences as passive sentences.

1. We have invested a lot of money in new technology.
2. Has the invention of the internet changed society?
3. Will computers rule our lives in the future?
4. Solar-powered cars will replace today's cars.
5. They haven't discovered life on other planets yet.
6. We won't use paper and pens in the future.
7. Someone has bought five laptops online using my credit card.
8. Have faster cars made the roads more dangerous?