He said he would come right away.

That idea is just right, exactly what we needed.

He is scheduled to come back in a week.

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

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 came, I saw, and I won.

We should always remember the power of Kannon in difficult times.

Since he is always laughing, it can be said that 'fortune comes in by a merry gate'.