The prefix "co-" could be used with the act.
The prefix for "cavated" could be "de-" as in "decavated."
You could add the prefix af- to it to make the word affluent.
The prefix "inter-" could be used with "cept" to form the word "intercept."
"Cost" doesn't have a prefix. You could add the prefix ac- to it to make the word "accost."
The prefix "co-" could be used with the act.
The prefix for "cavated" could be "de-" as in "decavated."
You could add the prefix af- to it to make the word affluent.
"Possibility" doesn't have a prefix. You could add the prefix im- to it to make the word impossibility.
The prefix "inter-" could be used with "cept" to form the word "intercept."
"Cost" doesn't have a prefix. You could add the prefix ac- to it to make the word "accost."
Renumber is a prefix numbered is a suffix
A possible prefix for "climbe" could be "dis-" as in "disclimbe."
One possible prefix for "rewrite" could be "re-".
A prefix for "repair" could be "re-" as in "rebuild" or "restore."
The current prefix is ex-. You could add the prefix in- to it to make the word inexcusable.
The current prefix is im-. You could add the prefix un- to it to make the word unimportant.