1.  To much reading, poor lighting and to much TV watching are the main reasons.

2.  he main reason is that when a child was playing the TV game .

3.  This is the main reason of changes .

4.  There are two main reasons to do so.

5.  What is the main reason that heath gains in developing countries .

6.  in 1990, the infant mortality is down to 100 deaths per 1000 births, some scientists think that the peace of the world and the better living sitution is the main reason for this fact.

7.  There are many reason but the main reason is that the living level of the people was increased in the developing countries.

8.  The main reasons are the treatment to them and whether their epencitly has a full reality .

9.  Also there is a main reason that some people like stability and lead a calm life.

10.  The main reason is people's living conditions have been better than before.