2. use the appropriate suffixes to change the words in capital letters. write the new words in the gaps. 1. fortunately, the number of people who worry about (7) problems is rising. it gives me hope that they will be solved. 2. in my opinion, air (8) is the most dangerous thing. we can make a supply of drinking water, but it’s not possible to have a supply of fresh, safe air. 3. the easiest way to save our planet and ourselves is to use (9) materials. they can be used again and again, without wasting more (10) resources. 4. don’t drop litter on the pavement! pick it up and put it into the (11) over there. 5. motorcycling is pretty dangerous. people should wear (12) helmets. сами слова которые нужно вставить: environment,pollute,recycle,nature ,contain,protect! !