V. Write the correct form of the words in brackets. 21. Just by wearing a virtual __________ headset, gamers feel as if they are actually in a new environment and have a real experience. (REAL) 22. __________ vehicles are becoming popular because they are more environmentally-friendly. (ELECTRICITY) 23. If you want to become a game __________, you need to be creative and have strong skills in computing. (DESIGN) 24. Bản Giốc waterfall is one of the most __________ waterfalls in Vietnam. (IMPRESS) 25. Computers are very __________ because we can use them for all kinds of online activities, such as reading books, surfing the Internet or watching films. (USE)