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This is a cheat sheet with a lot of the basic mathematical notation you will come across in popular science.

ordinal numerals and cardinal numbers

In this class we will practice speaking skill about family, friendship and happiness

Why is it hard to move a heavy bookcase across a carpeted floor? And why is it easier to keep it moving than it was to get it started moving? You might think it's all about weight, but actually it's about friction. Two kinds of friction! In today's episode of Crash Course Physics, Shini Somara tells us about Static and Kinetic friction; how they work and how they're different.

One of the world's most popular games, played by millions of people worldwide in homes, parks, clubs, online, by correspondence, and in tournaments. In recent years, chess has become part of some school curricula.

If you have not passed any test for 10 points, return to the appropriate sections of the grammar and analyze the incorrect answers using theoretical material.

In this lesson we will continue topic about food, discuss food habits. Also we will learn how to use passive voice in different tenses and practise grammar

In this lesson we will discuss what is Agile life and how to use it. Also we will have grammar - tenses

In this class we will revise present and past simple and continuous, articles and jobs vocabulary and do speaking tasks