The Great Wall of China is more than 6,000 kilometers long. It winds     1     (it) way from west to east, across deserts, over mountains, through valleys     2     at last it reaches the sea. The Great Wall has a history of over twenty-centuries. The first part of it     3     (build) during the Spring and Autumn Period. During the Qin Dynasty,     4     (keep) the enemy out of his empire, Emperor Qin Shihuang had all the walls     5     (join) up. Thus, the Great Wall came into being. The Great Wall is wide enough at     6     top for five horses or ten men to walk side by side. Along the wall are watchtowers,     7     soldiers used to keep watch. Fires were lit on the towers as a     8     (warn) when the enemy came.

It was     9     (extreme) difficult to build such a wall in the ancient days without any modern machines. All the work was done     10     hand. Thousands of men died and were buried under the wall they built. The Great Wall was made not only of stone and earth, but of the flesh and blood of millions of men.

5 . One of the most important creations of science is the invention of the lighthouses. Lighthouses help in a number of activities such as marking of the dangerous coastlines and directing safe entries to the harbours. The following are some famous lighthouses.

It is located in Saudi Arabia. This lighthouse has been constructed very beautifully and adorns a beautiful structure. The Jeddah Light was built in 1990. This lighthouse is considered as the tallest of the world reaching a fine height of around 436 feet.

It is addressed as the “lighthouse at the end of the world”. The Les Eclaireurs Lighthouse is located on a small island east of Ushuaia, the southernmost city of the world. This lighthouse was built in 1920 and today it has become a very famous tourist attraction in Argentina. However, visits to this lighthouse can be made only by boat.

Lit in 1915, it is an icon and a popular monument of Canada. The Peggys Point Lighthouse has become a major tourist sight and is considered as one of the busiest attractions in the area of Nova Scotia. This lighthouse also fetches you a wonderful scenic drive and visiting here, you can indulge yourself in the beauty of nature.

It is the northernmost lighthouse that is located on the mainland of Europe and is considered as one of the most famous lighthouses of the world. This lighthouse is mostly considered as the North Cape Light and is the top lighthouse of Europe. The Slettnes Lighthouse firstly began to light in 1905. Though it was highly damaged during the World War Ⅱ by the Germans, yet it was restored and lit again. This lighthouse is very classic as to its looks.

6 . The world maps will soon be altered to reflect an eighth continent! Dubbed "Zealandia" the landmass that lies east of Australia covers 4.9 million km. Over 94 percent of it is submerged (淹没的) in the southwest Pacific Ocean, with just the islands of New Zealand and New C aledonia visible above sea level.

To be clear, the underwater land is not a recent find. Researchers have known about its existence since 1995 when Bruce Luyendyk discovered and proposed an eighth continent that he called Zealandia. At the time, the area was dismissed as a collection of islands and land fragments (碎片), or at the most, classified as a micro continent—a landmass of continental crust that is not geologically connected to the nearest continent, in this case, Australia.

However, after observing the areas features on an underwater topography map, New Zealand geologist Nick became convinced that Zealandia is a continent. Mortimer says that while Zealandia is much smaller than our seven continents, at over half the size of Australia, it is unfair to classify it as a microcontinent. The geologist argues, “If you could pull the plug on the world’s oceans, then Zealandia would probably long ago have been recognized as a continent.”

Geologist Christopher Scotese argues that too much of the landmass is underwater, asserting it’s “almost a continent the way Pluto is almost a planet.” Richard Ernst, a geologist, proposes coining a new term minicontinent—for Zealandia. He thinks this is perfect given that it is too large to be called a microcontinent and too small to be classified as a full-sized continent. Given that there is no international panel to decide the fate of Zealandia, its future as a continent is uncertain. Mortimer hopes that if supporters start using the term Zealandia, it may eventually catch on. Whether that happens remains to be seen, but for now, we will have to be satisfied with just seven continents!