The United States of America lies in the North America. It is washed by the Pacific Ocean in the west and the Atlantic Ocean in the east. It has sea borders with Canada, Mexico and Russia.
The landscape of the country varies: there are mountain chains, plains, canyons and deserts. The highest mountains in the country are the Rocky Mountains or the Rockies.
There are a lot of lakes and rivers in the USA. The Mississippi which joins the Missouri is the longest river in the United States. It flows to the south and runs into the Gulf of Mexico at New Orleans.
The region of the Great Lakes is a system of five great lakes (Lake Superior, Lake Michigan, Lake Huron, Lake Erie and Lake Ontario). The famous Niagara Falls are situated in New York State and are the biggest falls in the world.
The climate of the USA varies. The country is situated mainly in the temperate and subtropical zones.
The United States is rich in mineral resources such as: coal, iron, gas, oil and different metals. There are silver and gold deposits in the United States, too​

Agatha Christie is known all over the world as the Queen of Crime. She wrote 78 detective novels, 19 plays, and 6 romantic novels. Her books have been translated into 103 foreign languages. They are the third best-selling books in the world (after Shakespeare's works and the Bible). Many of her novels and short stories have been filmed. The Mousetrap, her most famous play, is now the longest-running play in history of world theatre.

   Agatha Christie was born at Torquay, Devonshire. She was educated at home and took singing lessons in Paris. She began writing at the end of the First World War. Her first novel, "The Mysterious Affair at Styles" was published in 1920. That was the first appearance of Hercule Poirot, who became one of the most famous private detectives since Sherlock Holmes.

1 It won't cost much money to travel on Hyperloop One.

2 We need to come up with ideas for energy- efficient transport.

3 New means of transport will replace the trains and aeroplanes we use today.

4 Hyperloop One will transform the way we travel.

5 Solar panels are an eco-friendly way to generate electricity.

6 The company wants to develop an eco-friendly mode of transport.

7 The inventor plans to hold a public test of his high-speed train.

8 Does the technology exist to create the first working vac train?