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

2) The word "chocolate" contains four vowels: O, O, A, and E.

3) Tom Hanks is an American actor and filmmaker known for his versatile performances in films such as "Forrest Gump," "Saving Private Ryan," and "Cast Away." He has received numerous awards, including Academy Awards, Golden Globes, and BAFTAs.

4) The Great Barrier Reef in Australia is the largest living structure on Earth and can be seen from space.