Here are the sentences rewritten in the passive voice:

1. The house is cleaned by the cleaner at David's request.
2. The meeting is ordered by Jack's secretary.
3. The lesson is fixed by the mechanic at my mom’s request.
4. It is thought by people that climbing is a dangerous sport.
5. It is said that the cat likes to catch big mice.
6. Don't make your room messy.
7. This work must be finished by them tonight.
8. When was French learned by you?
9. How long has Ha Long Bay been visited by them?
10. Who are you met by at the weekend?

Note: Some sentences can be translated in different ways depending on the context and the intended meaning.