Sand is __________ (soft) than a rock.
softer
A duck is __________ (noisy) than a bee.
noisier
A fly is __________ (quiet) than a frog.
quieter
A lime is __________ (sour) than an orange.
sourer
A field is __________ (large) than a garden.
larger
A frog is __________ (big) than a fly.
bigger
A bee is __________ (small) than a duck.
smaller
A rock is __________ (hard) than sand.
harder
Plants are __________ (green) than sand.
greener