Put the words in the correct forms to complete the sentences

1. His
   [ ]
   studies have brought many benefits.
2. Unfortunaly, humans create a(n)
   [ ]
   environment for themselves and nature.
3. It is necessary to
   [ ]
   most of the industrial plants and factories.
4. My best friend is a very
   [ ]
   person. I like his paintings.
5. The Internet provides many
   [ ]
   for online learning.
6. This
   [ ]
   picture was painted by a great Russian artist.
7. World Extreme Games is an annual sporting event which
   [ ]
   in extreme sports.