Sure! Here are the sentences rewritten in passive voice:

1. The Internet is used by people all over the world.
2. Was the missing girl found by the police?
3. These tourist attractions are visited by large numbers of tourists annually.
4. Po Nagar Cham Towers were built to honour the goddess Po Nagar.
5. This museum is not visited very often by tourists.
6. All this cheese was bought by her in France.
7. I was not invited to their New Year party.
8. Is mineral water sold in plastic bottles by them?
9. The Imperial Academy is considered the first university in Vietnam by people.
10. When was Ha Long Bay recognised as a World Heritage Site by UNESCO?