Read the short passage and answer the questions about the United Kingdom.

The United Kingdom is a large island located in Europe. It also includes part of the island of Ireland. It is made up of four nations: England, Scotland, Wales, and Northern Ireland. Over 60 million people live in the United Kingdom. The vast majority of the population, however, lives in England. The government of the United Kingdom is considered a constitutional monarchy. A constitutional monarchy is a government in which the monarch (king or queen) is head of state. Queen Elizabeth II is the monarch of the United Kingdom. In reality, however, she exercises very little political power.

The history of the United Kingdom is full of wars, invasions, revolutions, and interesting rulers. Numerous castles, fortifications, old cathedrals, and ruins are evidence of the kingdom's past. The "UK," as it is often called, was once the world's most powerful nation. Canada, Australia, India, Pakistan, and even the United States, are among nations that used to be controlled by the United Kingdom. It is also the birthplace of the English language.

There are many remarkable landmarks to see in the United Kingdom such as the Tower of London, Big Ben, Oxford University and the mysterious Stonehenge. Oxford University, founded sometime in the 12th century, is the oldest university in the English-speaking world. Many of the United Kingdom's former prime ministers attended Oxford. Stonehenge, located near Salisbury, England, is a group of giant standing stones arranged in a circular formation. Archaeologists believe the formations are over 4,500 years old. No one knows exactly what Stonehenge is meant to represent.