Shenzhen is a city in South China.It is not very big, but it has attracted people of the whole country and the whole world as well. Just about twenty years ago, it was only a small fishing village.There were not many people there. Most of them lived on fishing.Things have greatly changed since the 1980s.It became the first special economic zone  in China. Because of the opening policy , economic changes between China and the outside world have increased greatly.People can come and go easily between Shenzhen and Hong Kong.Both foreigners and Chinese have built a lot of factories, companies and tourists' attractions there.People all over the country have come to find jobs.Many of them have settled down in this new booming  city. Shenzhen is developing so fast that it has become a well-known metropolis  in China. About twenty years ago most of the people in Shenzhen  _  .
worked in the factories did housework caught fish for a living lived a happy life