Do you think that what happening in the world everything is right?

Depends which side of the fence you are seeing the happenings.

Perfectness is  not possible. One this is good and bad both, it depends on our attitude.

i too believe in this phrase that "everything happen for a good cause". i think whatever is happening in this world is for our good. 

Nothing is perfect in this world. We all say 'everything happens for good reason' to convince our mind,  when things don't go as our wish

Nothing can ever be either completely wrong or right. Depends on how and which way you look at things.

Bajirao wrote:

Nothing is perfect in this world. We all say 'everything happens for good reason' to convince our mind,  when things don't go as our wish

Because we don't know  about the future. It might seem bad in the present but at last the result could be different.