Rewrite the sentence using a present perfect passive with by. Leave out any unnecessary words

Rewrite the sentence using a present perfect passive with by. Leave out any unnecessary words.

1. 
   Cheaper air travel has made possible the global expansion in tourism.
   

2. 
   Countries all over the world have experienced a growth in tourism.
   

3. 
   Millions of tourists have visited the popular Mediterranean resorts since the 1970s.
   

4. 
   Recently tourists have chosen more distant locations in Africa, Asia and South America.
   

5. 
   Mass tourism has badly affected some countries.
   

6. 
   International companies have built large hotels on unspoilt coastline.
   

7. 
   These developments have disturbed local people.
   

8. 
   Tourists have damaged coral reefs and other habitats.
   

9. 
   Such developments have also displaced local people.
   

10. 
    Some governments have developed the idea of ecotourism to counteract some of these problems.
    

3. 
   
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