11.  But, the most important reason is the enconamic has taken great progress in recent years in developing countries.

12.  But its important reason is that the pollution of fresh water are increased quickly.

13.  The most important reason is pollution, which polute the sourse of fresh water and make it too dirty to use.

14.  The last important reason is the pollution.

15.  The examination I must past , more important reason is that the lauguige is useful in future.

16.  This is also an important reason in it, because students now have great eager to know "why it works?"

17.  I have left out the most important reason why I want to be a doctor.

18.  This is the most important reason.

19.  Someone like do one job, this because someone want to stable life, this is the important reason, only stable wages and condition suit him, he don't want to change .

20.  Someone like do job, this because someone want to stable life, this is the important reason,only stable wages and condition suit him, he don't want to change .