请帮我分析3道英语题
1I have no desire other than to lead a quiet life,______from anxiety.
A absentB separate C free D short答案：C
2______to his scientific research,the professor cared little about his family.
为什么是devoted不是devoting
3 Some students remember much knowledge but can't recognize ways to use it in new_______
A conditionsB cases C backgrounds D situations答案：D