* Fill in the blank.

Polish is the ___________________ language of Poland.

* Fill in the blank.

Many environmental organizations around the world are working to raise people's ___________________

of the negative effects of plastic trash on the planet.

* Fill in the blank.

Some hotels are taking steps to reduce the amount of water and energy they use and become more environmentally friendly. The ________________________ is to move toward more sustainable tourism.

* Fill in the blank.

Budget airlines are generally successful because they offer very low airfares, not because they allow

passengers to travel in ________________________.

Traditional guidebooks describe just the best-known ________________________ and places to visit in a

city or country, but guidebooks for eco-tourists tend to be different.

Wind, water, and the sun are some examples of ___________________ sources of energy.

Getting people to rethink the way they buy and consume food is ________________ for reducing the

amount of food that is wasted in homes, restaurants, and supermarkets every day.

Pollution is posing a serious threat to the ______________ balance of the oceans.

These visits are often more ________________ when tourists have the chance to interact with local people employed as official guides.

Our ____________ existence affects our physical existence.