er的：
higher
taller
shorter
cooler
longer
faster
smaller
lower
sharper
clearer
r的：
larger
wider
braver
safer
ruder
wiser
simpler
finer
cuter
later
ier的：
busier
funnier
crazier
easier
happier
angrier
sillier
lonelier
lovelier
sleepie
请写出十个直接er的比较级,和写出十个直接加r的比较级,还有写出10个改y为i加er的比较级