Here are the answers to your questions:
Question 1: The "Shot Heard 'Round the World" took place in what year?
Answer: A 1775
Question 2: The victory at The Battle of ___ proved to be a "turning point" for the United States in 1777.
Answer: C Saratoga
Question 3: General Cornwallis surrendered to General Washington on October 19 of what year?
Answer: B 1781
Question 4: About ___ years elapsed from the first shots of the Revolutionary War to its official end.
Answer: D 8 (The war began in 1775 and officially ended in 1783, which is 8 years.)