Scientists have been looking for "innovative" ways to produce energy; they know the old ways won't work forever. (cheap / new / strong)

The river that runs through the city has become very "polluted" from all of the garbage and chemicals that have been poured into it. (deep / clean / dirty)

Isabel volunteered to help "restore" the old art museum in the city. She helped paint the outside and rebuild the roof. (damage / fix / sell)

The new mayor is concentrating on cleaning the City by planting more trees and opening more Parks; this is one way to improve the "quality of life" for residents. (well being / choices / energy)

Leaving a large carbon footprint now may "threaten" the future of our planet. (risk / help / support)

The time has come to think of different ways to farm instead of the "traditional" farming methods. (creative / usual / unusual)

Our apartment building has a large vegetable garden on the roof, and we sell the "produce" to the vegetable market in our neighborhood. (meat and fish / fuel and energy / fruits and vegetables)

Our new heating system is very "efficient". We were amazed at how well it worked and how much money we saved. (expensive / effective / complex)

The difference between "urban" residents and country residence is that those living outside of cities are dependent on using cars. (country / city / international)

The wind turbines "generate" so much energy that the Farm sell some of it back to the electric company. (create / use / lose)