Answer:
1) ; 2) : 3) - 4) ;
Explanation:
1) When using "however" to combine two independent clauses into a single, compound sentence, you must use a semicolon before and a comma after however.
2) The colon is the only punctuation mark that can be used to introduce a list.
3) A dash is used in this case to connect two clauses in an abrupt way, characterizing the suddenness of the moment of decision.
4) Two independent clauses are typically joined into a sentence here with a semicolon.