Answer:
Recklessness: Illumination
Understanding: abandonment
Lost in thought: Vacant
Calm personality: Composed
Explanation: I might have gotten a couple mixed up, but for the most part this is correct. Sorry If I'm wrong on anything!!
I think it would be C) singing
They can't pass the exam unless they "study" hard.
Its the spread of disease from one person to another but it dose no have to be a disease