Question

correct the text by inserting one comma.
cruise ship passengers can enjoy activities on board or they can go ashore and visit any of the many tourist sites and shops in port.

Explanation:

The sentence has two independent clauses ("Cruise ship passengers can enjoy activities on board" and "they can go ashore and visit any of the many tourist sites and shops in port") connected by the conjunction "or". A comma should be placed before "or" to separate the independent clauses.

Answer:

Cruise ship passengers can enjoy activities on board, or they can go ashore and visit any of the many tourist sites and shops in port.