Answer:
1. Through France and Belgium...from the Swiss border to the North Sea.
2. Soldiers fought against each other in trenches. Life in trenches was miserable and they often died from diseases.
9. Red
18. Politics, secret alliances, imperialism, and nationalistic pride
27. France, Russia, Germany, Austria-Hungary, Kingdom of Italy, Great Britain, and Italy
28. Russia, France, Great Britain, Germany, Austria-Hungary, Italy, and the United States.
33. y=Italy
z=France
x=Austria-Hungary
v=Germany
w=Russia
u=United Kingdom
Sorry, this is all I know. I hope it helped.