1) The English alphabet has five vowels: A, E, I, O, and U.

2) The word "oxygen" contains two vowels: O and E.

3) The European Union (EU) is a supranational organization comprising 27 member states that cooperate on various issues, including trade, economic integration, and common policies, while preserving individual national sovereignty.

4) Insurance premiums are the payments made by policyholders to insurance companies in exchange for coverage.