What goes up but never ever comes down?

Which statement would you identify as being correct? a. it is important to learn the etymology of every word in a text. b. it is important to understand the etymology of every word in a text. c. it is important to study the etymology of every word in a text. d. it is important to study the etymology of some words in a text.

What is meant by “eternally burning black pipes”? what is this implying about the personality of the firemen?

Brendan is playing in the backyard.