Complete the sentences using the words and phrases in 1.

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
   carbon footprint      Eco-friendly      energy      household appliances      litter   
1. car models always attract great attention at exhibitions.
2. Remember to turn off your when they are not used.
3. Small changes in your daily habits can help reduce the you produce.
4. One of the most important sources of is the sun.
5. Students are reminded to pick up that they see on the ground.