题目内容：

1.My grandma likes to be with the young though she is in her _________ now.

2.Those __________ books will be donated to the schools in poor areas.

3.It is difficult work, but the sense of _________ is huge.

4.The patient is getting much better after the operation and now she can look after _________.

5.To make a green world, we should try to reduce air _________ by walking more and driving less.