Calaméo - Лексический минимум продвинутый
2019-6-25 · The __ severe threat to th e environment comes from air travel. 2 In the past, business and environmental __ have always been in _ _ to each other. 3 We cannot delay action an y _ _ - steps have to be taken. 4 One of the __ problem s is th at man y people do not realise how bad the situation __ is.