请根据句意从方框中选择合适的单词，并用其适当形式填空，使句子通顺。

My grandma likes to be with the young though she is in her            now.
Those             books will be donated to the schools in poor areas.
It is difficult work，but the sense of            is huge.
The patient is getting much better after the operation and now she can look after          .
To make a green world，we should try to reduce air         by walking more and driving less.