He values his private life.

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.

He remembered the proverb 'even a pig will climb a tree if flattered', and complimented his boss.

The failure of the project was due to a situation where too many cooks spoil the broth.

Will you marry me?

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

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

He was hiding the fact that he was an illegitimate child.