Chinese Quiz

Here is this week's quiz:

1. What is the population of China?
2. What is the official language of China?
3. What is the main ethnic group in China?
4. What was China's first great contribution to civilization?
5. What was the last imperial empire in China, and how long did it last?
6. When did the period of Warring States end?
7. What is the capital of China?
8. Where is The Bund?
9. What percent of land usage is for forestry?