根据句意及汉语提示完成句子

1. If you want to be healthy ,you must take more____（运动）.

2. Air travel is the most____（舒服的）way to travel long distances.

3. The family lived in a small house with no____（空间）for children to play.

4. People put their rubbish outside in the streets. As a result，there were  many____（疾病）.

5. In the past, his grandfather worked 12 hours a day, in dangerous and____（不健康的）jobs,

for very little money.

为了评价风险，常采用三元组[ri，pi，xi]来描述风险。其中ri代表第i种风险，pi表示第i种风险发生的概率，xi代表（）。