翻译四个英语句子

1.近年来我们看到了很多歌手的兴衰。

We___ ___many singers___ and ___over the years.

2.即使天黑了，我也要找到那个丢失的孩子。

3.护士的工作是尽可能好的照顾病人。

4.青少年应该被允许选择自己的衣服，不是吗？

第3句我不知道是as well as possible 还是as good as possible，可以解释下么？

第4句，情态动词的被动语态的反意疑问句应该是怎样的？是aren't they 还是shouldn't they？？

另外for years是什么意思，用在句尾。。。

1. have seen, rise, decline
2.Even it is dark now, I also need to find that missing child.
3. To look after patients as well as possible is the work of nurse.
形容人的健康用well.
4. 用shouldn't they, 前面半句有should
for years, 多年以来

1have seen rise and decline

2Even if the sun goes down, I would like to find the missing child

.3 Nurse's job is the as well as possible care to patients