Have you ever wanted to do something

Have you ever wanted to do something 1) ( different / difference / differ / differently )? Five years ago Bill Slade read about an organization 2) ( call / called / calls / calling ) Earthwatch . Earthwatch finds 3) ( volunteers / activities / programs / resources ) for expeditions to study and explore different parts of the world.
Bill decided 4) ( join / joining / to join / joined ) an expeditions to study elephants in Africa and he 5) ( counts / counted / counting / to count ) birds in the rain forests of South America . He planted 6) ( trees / parks / lakes / bushes ) in Europe and he studied whales 7) ( at /in/on/up) the Pacific Ocean . Bill said ,''It was 8) ( hard/hardly/more hardly / more harder ) work , but we had a lot of fun, and I learned a lot , too.''