Here are the correct responses to your questions:
Question 1: What was the primary goal of Lenin and the Bolsheviks?
Response: Overthrow the Provisional Government and establish a communist state
Question 2: What was the effect of the Treaty of Brest-Litovsk?
Response: Russia exited World War I
Question 3: What was one of the primary objectives of Stalin's first Five Year Plan?
Response: To rapidly industrialize the Soviet economy
Question 4: How did Joseph Stalin maintain power in the Soviet Union?
Response: He made himself feared by imprisoning and executing political opponents.