Solution:
- 1. The sentence describes a risk that can be avoided, so the correct word is avoid.
- 2. Sportsmen can suffer injuries, which is consistent with the context of breaking bones. So, the correct word is injuries.
- 3. The context describes something that might seem surprising or hard to believe, making unbelievable the most suitable word.
- 4. The paragraph discusses the serious consequences of not concentrating or making mistakes, which can lead to danger. Therefore, risks is the most appropriate word.
- 5. The sentence implies that not concentrating on the speed of the wind can lead to problems. The word miscalculate fits this context best.
- 6. The sentence states that if sportsmen forget to check something, they can get into danger. Equipment is essential for many sports and needs to be checked.
Answer: 1. avoid, 2. injuries, 3. unbelievable, 4. risks, 5. miscalculate, 6. equipment