1.  I think that the first reason is the rapid development of developing countries.

2.  The first reason is the raised life.

3.  The first reason is that the living condition is improved.

4.  The first reason is the development of the industry provides more things (for example: the computer, the ice-box, etc) it changes the livings of the people of the developing countries.

5.  The first reason is that the developing countries have rapid development in medicine People's lifes are increasing.

6.  The first reason.

7.  First reason, they still don't find what kind of job is fittest for them.

8.  First reason is that some countries have liberated and people have become their own master .

9.  I think the first reason is that people's living standard is developing quickly.

10.  The first reason, when we want to do something, we must do little things firstly , then we can succeed in doing this thing,in general, we can't succeed in doing something immediately .