The children walked from house to house, shouting 'trick or treat'.

Looking out the window, there was a rain shower.

The space complexity of this algorithm is O(n).

The school chime rang out, 'keen-korn-karn-korn.'

The center of this plate is sunken.

Every morning, I boil ripe tomatoes to make soup.

UNESCO is an international organization that promotes the development of education, science, and culture around the world.

The Uniform Resource Locator indicates the address of a web page.

Before starting a new business, he said, 'Nothing ventured, nothing gained.'

He raised his hand and asked a question.