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엑스트라

A lesson about the role of carbon dioxide in the atmosphere.

A lesson about balance and equilibrium.

In this lesson, we are going to learn some common collocations with make, do and have.

In this lesson, you can learn about the Huguenots and the cruelest religious war of the 16th century.

Learn about the electric current and its different forms in electrical networks.

Where do you have to place an object around the Earth to keep its location stable?

Learn about the two metals commonly used for soldering.

The 4th largest country in the world has a diverse range of natural resources.

Learn about the history of world's fairs from the beginning to the present day.

Learn about the society and economy of the United States of America.

Learn about mercury and its most important compounds.

Learn what medieval European people ate and how they prepared their meals.

In this lesson, we are going to learn some colours.

In this lesson, you are going to learn about definite and indefinite articles.

This lesson explores the practical uses of remote sensing.

In this lesson, you are going to learn about different expressions of quantity.

Learn about Franklin D. Roosevelt, one of the most popular presidents in the history of the United States.

Learn about the history of the global economic depression that began in 1929.

In this lesson, you can learn about how organic chemistry developed and what it studies.

Learn about colours in a playful way and try colour mixing.

This lesson is going to show how to use the Present Simple and Continuous tenses.