graffiti

green space

homeless

juvenile delinquency

litter

low-income

mayor

poverty

residential area

slum

suburb

traffic jam

unemployment

assume

attempt

develop a theory

disturbed

get to the bottom of

look into

missing

notice

occurrence

research

reveal

source

turn out

vanish

wonder

anxious

corpse

dust

eruption

flame

flashing

glowing

haunted

laughter

proof

relief

roar

shadow

smoke

wave

whisper

advisor

ally

army

assassination

crown

downfall