Alexandria is a beautiful city in Egypt.

My pet gerbil is very cute.

Alex is my best friend.

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.

He played a perfect fifth scale on the piano.

He is a perfectionist, so he is very strict about his work.

Alexander is considered one of the greatest leaders in history.