The Paleogene period was a very important time in the history of the Earth.

I have been to Chicago.

Linear programming is a part of operations research and is used to find the optimal solution.

Paying the urban planning tax is a citizen's duty.

The United Nations Environment Programme is providing solutions to global environmental problems.

I'm sorry, but I don't speak Japanese.

Will you marry me?

She used to be a prostitute, but now she has started a new life.

"Do you want to have a meal? Take a bath? Or choose me?" she said jokingly.

I'm a Muslim, so I fast during Ramadan.