Misc: nylon was invented simultaneously at these two cities?

Questions

All gondolas in Venice, Italy must be painted---------- , unless they belong to a high official.?

All gondolas in Venice, Italy must be painted black, unless they belong to a---------- .?

Although modern images of India often show poverty and lack of development, India was the richest country on earth until the time of British invasion in the early ---------- Century.?

American astronauts must be under ---------- feet.?

Antarctica has no native---------- .?