11. The ____________________ are very concerned about the increasing number of wildfire in this year. (ENVIRONMENT) 12. Examples of primary _______________ are exhaust fumes from cars, soot from smoke and ash from volcanic eruption. (POLLUTE) 13. Helen cannot talk to John because his nickname is . (visible) 14. Niagara Falls, on the border of the USA and Canada, is one of the most _____________ sceneries in the world. (SPECTACLE) 15. Different kinds of environmental pollution in recent years have destroyed many _____________ habitats. (NATURE) 16. The birth of emails has made the_____________ among people much easier than before. (CORRESPOND) 17. The Internet is _____________ again. It is so annoying! (CONNECT) 18. Snail mails seem less ____________________than emails. (ADVANTAGE) 19 I think Janet is not because of her unfriendliness. (communicate) 20. The Telegraph was one of the most well-known _______________in the 20th. (INVENT) Help cần gấp trước 6h25 phút Yêu cầu : Chỉ cần đáp án không cần phải