His sister waved around the tree.
With the A. migration of people from fertile areas, knowledge of agriculture spread by diffusion.
When people migrate from a place, they move into other areas. When something diffuses, it spreads around.
Answer:
can you be more clear about what you're asking?
Explanation:
1. Our classroom has been decorated by my classmates.
2. All the biscuits have been eaten by children.
3. This land has been bought by property developers.
4. A hand hasn’t been asked to be given to them.
5. A lot of good work has been done by charities in this country.
6. The new bridge has not been build by them yet.
I tried my best, but there are different ways of wording these sentences in passive voice, I hope it helped anyway :)