Discuss the following questions. 1) do people often get injuries in sports? in what kinds of sports do people get injuries more often? 2) what can people do not to get injuries while doing sports?

Вообще, тебе нужно обсудить данные вопросы. 
Дискутировать я тут не буду. Но вот натолкну тебя. 
1. It depends on the type of sport.Extreme or not...
As I said, in the extreme sport, or those where a lot of physical contact. For example, football, hockey, boxing and so on. 
2. Injuries can not be avoided at all. But sportsmans can be more  attentive.  They can use a special protection