Look at the grid and complete the sentences. Guess the hidden word

1. A
   [ ] rolls down a hill, at high speeds, strapped inside a large plastic ball.
2. He got a nasty
   [ ] on the head when he fell.
3. With his
   [ ], the boy was able to stay underwater and look at the fish.
4. [ ] is possible wherever there are hills of sand.
5. Sam is
   [ ] to extreme sports!
6. There were 100
   [ ] in the writing contest.
7. Underwater hockey
   [ ] in Britain where it was invented by a diving club.
8. The hidden word is
   [ ].