Put the following sentences into the opposite voice (active or passive)

Put the following sentences into the opposite voice (active or passive)
1. No one could do anything to put the fire out.
2. You shouldn't expect your friends to help you.
3. Bananas are exported to Europe.
4. They have discovered oil at the North Pole.
5.where do people speak English?
6. Fortunately the machinery wasn't damaged by the accident.