Ex7: Write the correct form of the given word 
1. People are using more and more .......................- friendly products ( ENVIRONMENT )
2. Smoke from vehicles is responsible for the air ......................in our city  ( POLLUTE ) 
3. If we turn off lights when we leave a room , we can save ...................... ( ELECTRIC )
4. Eating .....................fish can lead to serious health issues.    ( POISON ) 
5. The ..................impact of the oil spill was too serious for the local ecosystem to recover  ( ENVIRONMENT ) 
6. The future of a country's ..........................is directly linked to the environment .  ( TOURIST )
7. We should ..................furniture so we can give old furniture a new life . ( USE )