Answer:
(For "Hongkong is China too, is it true?")
Hong Kong is one of two Special Administrative Regions of China (SAR) which enjoys a high degree of autonomy as a part of the People's Republic of China, which is guaranteed under Article 2 of Hong Kong Basic Law as ratified under the Sino-British Joint Declaration.
(For "What is their language")
The official languages of Hong Kong are Chinese and English.
