It looks like you're working on a language exercise that involves direct and indirect speech transformation. Here are the transformations for the sentences you provided:

6. **They advised us to take a bus downtown.**
→ We were advised to take a bus downtown.

7. **The organization asked him to take an English test.**
→ He was asked by the organization to take an English test.

8. **They say that she is the best student in the class.**
→ It is said that she is the best student in the class.

9. **They told us to go home and wait.**
→ We were told to go home and wait.

10. **The teacher told us to work harder on English pronunciation.**
→ We were told by the teacher to work harder on English pronunciation.

Feel free to ask if you need more assistance!