Misc: What's the name designated to pay grade E-2 in the US Marine Corps?

Questions

Japan consists of the four large islands of Hokkaido, ----------, Shikoku, Kyushu, and about three thousand smaller islands.?

Lake Baikal in -------------- is the only lake in the world that is deep enough to have deep-sea fish.?

----------- is the only country in the Middle East that does not have a desert.?

Located 137 miles north of Rome, ------------- is the oldest and one of the smallest republics in the world.?

Located in the Indian Ocean just north of the equator, ---------- had a highly developed civilization as early as the fifth century B.C.?