calm – excited
careful – careless
careless – careful
catch – miss
ceiling – floor
cellar – attic
centre – outskirts
certainly – probably
changeable – constant
cheap – expensive
child – adult
children – parents
clean – dirty
clear – cloudy
clever – stupid
close – open
closed – open
cloudy – clear
cold – hot

come – go
comedy – drama
complicated – simple
compliment – insult
compulsory – voluntary
connect – separate
consonant – vowel
constant – changeable
construction – destruction
continue – interrupt
cool – warm
correct – wrong
courage – fear
courageous – cowardly
cowardly – brave
create – destroy
cruel – human
cry – whisper
cry – laugh