II. Read the passage and answer the questions

We are all destroying the earth. The sea and the rivers are too dirty to swimming in. There is so much smoke in the air that it is unhealthy to live in many of world’s cities. We have cut down so many trees that there are now vast areas of wasteland all over the world. As a result, farmers in parts of Africa can’t grow enough rice to eat. Wild animals are quickly disappearing. We must save the earth.

1. 
   Are we are all destroying the earth? ...............................................................................................
   
2. 
   What are too dirty to swimming in? ..............................................................................................................
   
3. 
   Why is it unhealthy to live in many of world’s cities? ..............................................................
   
4. 
   What disappear quickly? ..............................................................................................................
   
5. 
   What must we do now? .........................................................................................................