Potential matches:
1 : third largest city. a port city and manufacturing center.
2 : the cultural center of china; 2008 olympics were held here.
3 : capitalist economy, operating somewhat independently from china.
4 : the largest city. major economic and financial center. terrible pollution.
answer
: shanghai
: beijing
: guangzhou
: hong kong

1- Guangzhou: Third largest city. A port city and manufacturing center.

2- Bejing: The cultural center of China; 2008 Olympics were held here.

3- Hong Kong: Capitalist economy, operating somewhat independently from China.

4- Shangai: The largest city. Major economic and financial center. Terrible pollution.

Explanation:

1- Guangzhou is a prefectural city and the provincial capital of Guangdong province in the south of china. Since 2005 it is one of the five national central cities.   The city is an important port city. The port has been the fourth largest in the world since 2006.

2- Beijing is the capital of the People's Republic of China. It has a population of more than 20 million inhabitants.

Beijing is China's political and cultural center, while China's most populous city, Shanghai, can still be said to be the country's economic center, in fierce competition with Hong Kong. Throughout its long history, Beijing has built up a diverse and unique cultural heritage. Most famous are the Tiananmen Square and the Forbidden City.

Beijing hosted the 29th Summer Olympic Games in 2008. An Olympic district was built in the north of the city; most of the sports exercises during the games took place there.

3- Hong Kong is a special administrative region in southern China, surrounded by Guangdong Province. It has a population of 7,500,000 inhabitants. Hong Kong has been considered the world's busiest port city.

4- Shanghai is the largest city in the People's Republic of China, and is the world's largest port city, with a population of 24,000,000 inhabitants.

The city is an important traffic hub, and a significant cultural and school center with numerous universities, colleges, research institutes, theaters and museums.