Fillin the gaps accordingto the model. clean -- . . -- . . . . -- more difficult -- most difficult fat -- . . -- . . . . -- . . --longest short -- . . -- . . interesting -- . . -- . . beautiful -- . . -- . .

Clean-cleaner-cleanest,
difficult -..-..,
fat-fatter-fattest,
long-longer-longest,
short-shorter-shortest,
interesting-more interesting-most interesting,
beautiful-more beautiful-most beautiful