4. Fill in the appropriate word from the list. 1. natural…. 2. industrial…. 3. harmful…. 4. oxygen…. 5. rare…. 6. ozone…. 7. ecological…. 8. acid…. 9. air…. 10. dead…. 11. beautiful….. substances, species, riches, security, fish, layer, rain, enterprises, balance, pollution, forests

aidafarhadova    1   19.06.2020 17:59    1