The poor are getting poorer and the rich are getting richer.
A leaflet is kind of like a brochure, but for whatever subject you’re doing it on. Can we see the directions please?
simple, would be the correct answer
(context) plain means ordinary, primary means first and essential means is always needed.
(more context) even though you should do spell check it shouldn't be first and isn't always needed and part of spell check is to make it so it's not plain