Some adjectives go with certain prepositions. There is no rule to tell you which preposition goes with which adjective. So when you learn a new adjective, it's a good idea to learn the preposition that goes with it, and write the "collocation" or combination down in your vocabulary notebook.
- at – surprised at, angry at, good at, terrible at.
- of – proud of, afraid of, fond of, full of.
- with – satisfied with, busy with, fed up with, associated with.
- in – disappointed in, skilled in, interested in, involved in.