1. Yes, it is nesessary to wear spesial boots because it is more useful to run in sneekers than in boat shoes
2. I'm not very good tennis player, so, i prefer to play witn friends not to be mocked
3. No, using a board in tennis?! that's quite a number
4. In summer i prefer to play volleyball. I play tennis in winter in sportcenter
5. People usually play tennis one on one, so it's only one person in the team
6. It's not very dangerous at all, but if you are stupid even chess may be dangerous for you