Final answer:
The given sentences are changed to passive voice while maintaining clarity and accuracy.
Step-by-step explanation:
4. You are advised to consult a good doctor. (Passive: A good doctor is advised to be consulted by you.)
5. The teacher was pleased with the boy's work. (Passive: The boy's work was pleased by the teacher.)
6. You will be given a ticket by the manager. (Passive: A ticket will be given to you by the manager.)
7. The trees were blown down by the wind. (Passive: The wind blew down the trees.)
8. Passengers are advised to book their tickets early. (Passive: It is advised that passengers book their tickets early.)
9. The snake was killed with a stick. (Passive: Somebody killed the snake with a stick.)
10. This house was built by John Mathews in 1991. (Passive: John Mathews built this house in 1991.)