With the knowledge of hindsight, what suggestions would you make to the Big 4 at Versailles in 1919?
"what suggestions would you make"
No one can answer this except you since it's asking for YOUR OPINION.
http://www.google.com/search?aq=f&sourceid=chrome&ie=UTF-8&q=Versailles+1919 << Read widely, and take good notes. Then draw your conclusions.
Please repost when you have written all this up, and someone here will be happy to critique your writing.