#1
cold-colder-coldest
bright-brighter-brightest
?
beautiful-more beautiful-(the)most beautiful
wett-wetter-the wettest
dirty-dirtier-the dirtiest
warm-warmer-the warmest
many-more-most
#2
larger
faster
better
thinner
more expensive
#3
most interesting
coldest
best
prettiest
laziest
#4
safer
best
bigger
strongest
more difficult
faster
warmest
colder
largest
littler