Can you help me out with this questions about World War II...?

1.-Why didn’t England and France stand up to Germany when Hitler wanted the Sudetenland in Chechoslovakia? 2.-True or False: Stalin caused a famine in the Ukraine part of the Soviet Union because farmers refused to collectivize their farms. 3.- Who planned to overthrow Hitler? Why? Why did the plot fail? 4.- How was Hitler able to take all of Czechoslovakia after he took the first part?