The human heart is a muscle that lies on the left of the chest. It is about the size of a fist. The heart is like a pump that sends blood around your body. Blood gives you the oxygen you need . An average heart pumps about 70 milliliters of blood into your body with every beat. That’s about 5 liters every minute or about 7200 liters every day.

Contents (14 pages)

• Introduction
• Parts of the heart
• Blood circulation
• Heartbeat
• Changing heart rates
• Heart attack
• How to keep your heart healthy
• Exercises
• Word list
• Key

Image: “Diagram of the human heart (clean)” by Wnauta is licensed under CC BY-SA 3.0.

An endangered species is a plant or an animal that faces a high risk of disappearing forever. Sometimes this happens because they have lost their natural habitat, at other times humans are the cause for such species becoming extinct. Among the most endangered species are tigers, rhinos, elephants, as well as tropical plants and trees.

Contents (18 pages)

• Introduction
• Why species become extinct
• Protection
• Some of the world’s endangered animals
• Endangered plants
• The World Wildlife Fund
• Exercises
• Word list
• Key

Endangered sea turtle
Image: 303sstevens, CC BY-SA 4.0 ,
via Wikimedia Commons

Coffee is one of the most popular hot drinks in the world. Almost a third of the world’s population drinks coffee. People often meet at cafés or coffee shops for a coffee break during the middle of the morning or stop work in the afternoon to drink coffee.

Contents (21) pages)

• Introduction
• The coffee plant
• Harvesting and processing coffee
• How coffee is brewed
• History of coffee
• Types of coffee drinks
• Coffee production and consumption
• Exercises
• Word list
• Key

Image: Cup of espresso coffee, FreeSVG, Public Domain