Looking at these old photos brings up feelings of nostalgia.

We are working to improve our service.

We are working on improving the project.

He ran up the stairs.

The development of this area has just begun.

We are working hard to develop new software.

He is from the Hui people, a minority ethnic group in China.

It will take time to solve this problem.

He is working hard to figure out the mystery.

We will hold a cultural festival next week.