1 уровень
1-c
2-b
3-c
4-b
5-c
2 уровень
1-throw away
2-protected
3-waste
4-environment
5-plant
3 уровень
1-protective
2-natural
3-ecologist
4-prediction
5-used
4 уровень
1.Volga runs into the Caspian Sea
2-
3-Kazbek is the highest peak of the Caucasus mountains
4.I have never been to the Lake Onega
5.Washington is the capital of the Unites States