If there is no air conditioners, the weather will be very hot. The invention of air conditioners has brought a lot of convenience to human life. Air conditioners can control the temperature and humidity in the room, so that people can feel comfortable to live and work.

In the past, people used to cool their rooms by hanging _____1_____ on the windows. This method is not very effective, and it is easy to cause _____2_____. In 1851, a _____3_____ named John Gorrie invented the first air conditioner. He used ice to cool the air in his hospital room. However, his invention was not very popular at that time.

_____4_____ Carrier is considered the inventor of modern air conditioning. He was born in New York in 1876, and studied engineering at Cornell University. After graduation, he worked for a company that made printing presses. In _____5____, he invented the first air conditioner. He used chemicals to cool the air. His invention was very successful. His air conditioner could not only cool the air, but also control the _____6_____, and soon many factories began to use air conditioners to improve the working environment for their workers. His invention soon became popular, and he founded his own company, Carrier _____7______ Corporation, in 1915. Carrier’s air conditioners were used in many important buildings, including the United Nations Headquarters and the _____8_____ Building. They have become an essential part of life in many parts of the world.

Today, air conditioners are so common that we often take them for granted.  The air conditioner blows air over a _____9_____. This makes the air cool. The cooled air is then blown into the room.

Without air conditioners, the weather would be unbearably hot. The invention of air conditioners has brought a lot of convenience to human life. Air conditioners can control the temperature and humidity in the room, so that people can feel comfortable to live and work. Thank you for air conditioners! We couldn’t live without them!