Which is the principal island of Japan?

Which is the largest city in India?

Which country is bounded by Saudi Arabia, Oman, the Gulf of Aden, and the Red Sea?

Which 13th-century Mongol warlord controlled probably a larger area than anyone in history, from the Yellow Sea to the Black Sea?

What kind of wild cattle with shaggy coats and upturned horns live in the mountains of Tibet?