He likes to take a walk in the park at dusk.

The Tasmanian Devil, a species unique to Australia, has a very aggressive nature.

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.

There was a spot on his shirt.

I have been to Ahmedabad.

His jokes often turn out to be many a true word spoken in jest.

He is suffering from the consequences of his own actions. It's truly a case of reaping what one sows.

He was able to find a solution from a difficult situation.