7. There are some/two/many good reasons for…/to do…
There are two reasons for the changes in people’s living conditions. First, we have been carrying out an opening and reform. policy. Second, our national economy is developing rapidly and the birth rate has been put under control.
8. We have many good reasons for…
9. The reasons for… are that…
10. Different people have/hold different
opinions/views/viewpoints/points of view/standpoints on this
problem/issue.
Some believe that…;others argue that…;still others maintain that…