Bonjour !
Exercice A :
beautiful : more beautiful
hot : hotter
exotic : more exotic
dry : drier
rich : richer
large : larger
interesting : more interesting
delicious : more delicious
good : better
small : smaller
Exercice B :
Mike's ancestors were happier in the USA than in Italy. They weren't richer and their house was smaller, but they had a better and more interesting life !
Explications :
Adjectifs courts : adjectif + er (rich => richer)
Adjectifs courts qui doublent leur consonne : (hot => hotter)
Adjectifs longs : more + adjectif (interesting => more interesting)
Adjectifs qui finissent par "y" : adjectif + i + er (dry => drier)
Exceptions : good => better, bad => worse, far => farther
J'espère t'avoir aidé. Bon courage !