1.  Maybe the reason is the trees.

2.  The reason is only that she doesn't like to show herself in front of lots of people.

3.  One major reason is that although men and women are created equal, they are distinguished both physically and mentally.

4.  In my opinion, there are several reasons as follows.

5.  But the ability is still stay at very low-level, for which the most related reason is that I had few practice during my usual study and had no idea how to learn English well.

6.  The reason is that we live in the society with different responsibilities.

7.  The reasons are as follows.

8.  As far as I am concerned , there are two reasons leading to this phenomenon.

9.  My English has been bad for a long time, I think the most crucial reason is that I had never made a plan for English learning.

10.  The reason was their busy jobs, which tore them apart.