Our teachers/ suggest/ we/ prepare/ the final exams/ careful

Our teachers/ suggest/ we/ prepare/ the final exams/ careful.
Our teachers suggested that we prepared for the final exams carefully.
Our teachers suggest that we should prepare for the final exams careful.
Our teachers suggest that we should prepare for the final exams carefully.
Our teachers suggested that we prepare for the final exams careful.
It/ hope/ that/ newly discovered cave/ attract/ more tourists.
It has hoped that a newly discovered cave attracted more tourists.
It is hoped that the newly discovered cave will be attracted more tourists.
It hoped that a newly discovered cave will attract more tourists.
It is hoped that the newly discovered cave will attract more tourists.
The girl/ wonder/ how much/ it/ cost/ fly/ Hanoi/ Ho Chi Minh City.
The girl wondered how much it costed to fly from Hanoi and Ho Chi Minh City.
The girl wondered how much it cost to fly from Hanoi and Ho Chi Minh City.
The girl wondered how much did it cost to fly from Hanoi to Ho Chi Minh City.
The girl wondered how much it cost to fly from Hanoi to Ho Chi Minh City.