Вариант 1: People have always wanted to discover new things and new worlds. We have built spaceships to go to other planets and are planning to visit other galaxies one day. Meanwhile, we know very little about our own planet. The oceans, which cover 70 percent of the planet, are an unknown world to us., The Pacific Ocean is the largest one. The lowest point on the Earth is also there. It is called Challenger Deep and it was discovered in 1875. The Pacific Ocean stretches from the Arctic Ocean to the coast of Antarctica, but most of its water is in the warm tropics, which makes it warm., A lot of fish and animals live in the Pacific Ocean. The place is still waiting for researchers to discover its secrets for us. Since 2007 high-speed trains have become a common type of transport in Europe. They make it possible to cut travel times by hours., Вариант 2: Without the energy from the Sun, the Earth would have no life at all. Nowadays everyone knows that the Sun is a star. Like all stars, the Sun is a great burning ball of gases. To us, it seems large and red. The other stars look white or light blue because they are much farther from us than the Sun., In the past, many people believed that the Earth was the centre of the universe. They thought that the Sun and the stars went round it. Only in 1543, a great Polish scientist published a book in which he tried to prove a different point of view., According to him, the Earth and the other planets moved round the Sun. Those people who supported the scientist were often imprisoned and even killed., Вариант 3: The trains travel at 350 kilometres an hour, and this is not the limit! The only problem for the engineers is the loud noise the trains produce. People living in the areas the trains travel through suffer from the noise greatly., For their comfort, all the carriages are made sound-proof from the inside. Travelling on high-speed trains is comfortable and pleasant. In the future, a high-speed railroad network could cover most of Europe. For example, a trip from Paris to Rome could take only 3 hours!

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