Lyrics: I've been meaning to tell you I've got this feeling that won't subside?

Questions

Because of heavy traffic congestion, Julius Caesar banned all ---------- from Rome during daylight hours.?

Because of heavy traffic congestion, Julius Caesar banned all wheeled vehicles from Rome during---------- .?

Because of the ---------- content of the Dead Sea, it is difficult to dive below its surface.?

---------- are chief export of Nauru, an island nation in the Western Pacific.?

Bird droppings are chief ---------- of Nauru, an island nation in the Western Pacific.?