Turn the following nouns and adjectives into verbs with suffixes

Turn the following nouns and adjectives into verbs with suffixes -en, -ify, -ize.
(1)hard
(2)horror
(3)memory
(4)intense
(5)fat
【正确答案】：(1) harden
(2) horrify
(3) memorize
(4) intensify
(5) fatten