1.  I think the reason that caused the change is various, meanwhile the range of the life level is the chief cause.

2.  03% of total of water on the earth, while the growing population and the developing industry and agricalture need much more water, especially fresh water--- It is a chief cause of shortage of fresh water.

3.  The chief reason is he recognize that this job is unsuited to him.

4.  Why the legalization of euthanasia is strongly opposed in China, The chief reason is because it does not coincide with traditional Maral codes.

5.  He is now one of the chief engineers of that factory.

6.  Here is a story in the Bible: The chief priests promised Judas to give him money, because Judas wanted to betray Jesus to them.

7.  But when Judas, the traitor, saw that Jesus had been condemned, He was seized with remorse, and returned the thirty silver pieces to the chief priests and elders.