幫忙翻譯幾個(gè)簡單的句子, 中譯英

1.Some students think old books are not clean while some others want to keep their books.
2.But in order to saving resoueces,we still should...

Some students think that old books are not healthy, and there're also someone who want to keep theirs.

We should do... in account of saving resource

1,Some students think the old book is originally not that clean, have some a person to want to leave their books.
2, But for the sake of the economy resources, we still should....

1. Some students think that old books are not clean,and some other people want to keep their books.
2. However, for saving resource, we should still...

1\Some students think old books are not so clean, while others want to keep(保留下來的意思) theirs（名詞性物主代詞，省略 old books ）.
2\In order to preserve（固定搭配，在這短語中優(yōu)于save這個(gè)動(dòng)詞） the resources, we should...