12. __________________, many teenagers said they like table tennis. (surprise) 13. Christopher Columbus was one of the great __________________.

12. __________________, many teenagers said they like table tennis. (surprise)
13. Christopher Columbus was one of the great __________________. (explore)
14. He came first in the chess __________________. (compete)
15. He is a good pearl __________________. (dive)
16. The United Nations __________________ is an international one. (organize)
17. Before the __________________ of special breathing equipment, man couldn’t swim __________________under water. (free)
18. Jacques Cousteau was a French __________________. (invent)
19. All __________________ must play fair. (compete)
20. The __________________ of the video games become very rich nowadays. (invent)