CNN Posting : Protesters block Hong Kong government offices

The whole world is watching Hong Kong.
Their protest started for obtaining their right to choose their own minister.
But, the government of China doesn't seem to allow those protesters' demand.
Hong Kong is technically part of China.
But, actually they are independent of China economically, curturally, and historically.
I think they have right to choose their leader by themselves.
But the government of China want to control Hong Kong, so it will mustly suppress this protest.