Giải thích rõ vì sao lại viết như thế Supply the correct form of the words in the brackets 11. An (announce) _____________ about her future is expected soon. 12. (athletics) _____________ is someone who takes part in sports competitions. 13. She organized this year's _____________ Christmas dinner dance. 24 14. I hate to (disappointing) _____________ you, but I'm just not interested. 15. The course aims to develop the children's appreciation of music in (perform) ___________. 16. At that time children were encouraged to learn poems for (recite) _____________. 17. He's been chosen to (representtative) __________ Scotland in next year's World Cup Finals. 18. Kids' interest is often caught by visual (stimulate) _____________. 19. He has been an active (participate) _____________ in the discussion. 20. He's hoping to (competitive) _____________ in the London marathon.