变被动语态 急！

  不是每句话都能酿成被动语态的，我改了几句

Today,ways that use fewer trees for making paper need to be found。 Recycle paper reduces logging。 For example,old paper can be recycled five to seven times。

   Fewer trees are needed to make new paper。 30-year-old trees can be saved by one ton of old paper。

How does paper be recycled? First,the paper needs to be sorted。

   Then each kind of paper is cut up and mix ed with a lot of water。 This "soup"of papre and water is called pulp。 Some times,paperis recycled too much,making the fidlers。

  To solve this problem,new wood fibers are mixed with the pulp,which make the paper stonger。Finally,the pulp goes through a machine and comes out as paper。

  This recycled paper is almost as good as new paper。