1.When did Henry Ford sell the first Model-t motor car?
a. in 1903
b. in 1908
c. in 1910

2.When was the first talking movie, The Jazz Singer?
a. in 1903
b. in 1915
c. in 1927

3. When did Einstein publish his theory of relativity?
a. about 100 years ago
b. about 60 years ago
c. about 50 years ago

4. When was the Russian Revolution?
a. in 1909
b. in 1914
c. in 1917

5. When was the first non-stop flight around the world?
a. about 90 years ago
b. about 60 years ago
c. about 30 years ago​