justify alignment no very good in right hand side

[alan chow]

when I put a large paragraphs into a text box with mulit lines, the justify
alignment is not very good in the right hand side, for example, the following
shows the bad

This is a boy. This is a
boy. This is a boy. This
is a boy. This is a boy.
This is a boy. This is a
boy. This is a boy. This
is a boy. This is a boy.

You can see the left side is ok, but the right side is not ok.

Any suggestion?

thx.....