Which one of the following became a part of China in 1997 following the principle of 'one country, two systems'?

Which one of the following was the earlier name of Tokyo?

Which one of the following developments took place because of the Kansas-Nebraska Act of 1854?

Who among the following never became the President of United States of America?

In which one of the following cities is the Heliopolis Commonwealth War Grave Cemetery located?

Which one of the following combinations of year and event concerning the French Revolution is correctly matched?