Question

i - ready identifying central idea - quiz - level d
a shining glowworm
glowing gear
fireflies light up in quick flickering flashes. glowworms are different. they can emit light for long stretches of time. this ability, or power to do something, helped soldiers in world war i.
in europe, soldiers dug long, deep holes called trenches and spent long days and nights in them. when told to, the soldiers would come out of the trenches to fight. in the meantime, they had to eat, sleep, and go to the bathroom right there in the dirt. life in the trenches was scary, smelly, and grimy.
fill in the blank to explain what \grimy\ means.
the trenches were grimy because they were
long
dirty
old
deep

Explanation:

The text describes life in trenches where soldiers ate, slept and did daily - activities in the dirt. Words like "scary", "smelly" and context suggest "grimy" relates to dirtiness.

Answer:

dirty