There are places on earth that     1    ( puzzle) scientists in the past centuries and have been the subject of much discussion around the world.

Two of the most fascinating places are Easter Island and Stonehenge. Lying in the South Pacific, Easter Island is one of the most isolated places on earth and is famous for the large stone monoliths (巨石)that line its coast. Shaped like human heads, these structures,     2     were carved by ancient people, range in     3    ( high) from about 3. 5 to 12 meters. Today, about 600 stones remain. On the opposite side of the world stands Stonehenge. This ancient English site is a collection of large stones arranged     4     two circles, one inside the other. Although only ruins of the original formation exist today, archaeologists believe that the inner circle of bluestones, each     5    ( weigh ) about 4 tons, was built first. The giant stones that form the outer circle,     6    ( know) as sarsen (砂岩)stones, each weigh as much as 50 tons!

Scientists     7    ( current) believe that early Polynesians residents carved     8     island's monoliths—believed to be religious symbols—from volcanic rock, then pulled them to their different     9    ( location ) . And the enormous stones at Stonehenge     10    ( transport) from places around the country—some up to 240 miles away. Scientists consider this a remarkable achievement, for heavy lifting equipment used in modern construction was not available at that time.

Chinese Gardens

The Chinese garden has a long history. It first    1    (appear) as early as the 1lth century B. C. during the Zhou Dynasty. It is usually referred to    2    a place of beauty and a harmonious connection with nature.

Famous for the    3    (rich) of theme ideas, the Chinese gardens are deeply rooted in the traditional Chinese culture.    4    (base) on that, Chinese gardens focus on the harmony between heaven, earth and man. Honoring and following nature became    5    unshakable principle of building Chinese gardens. With this principle,    6    (create) a garden, designers integrate buildings, mountains, rivers and plants as one, featuring man-nature coexistence and harmony.

Typically, there are three major    7    (element) of a traditional Chinese garden: water representing    8    (constant) changing nature, stones    9    (indicate) stability and strength and plants providing beauty, harmony, etc.

Overall, the Chinese gardens do not take the actual landscape we can see as the ultimate design goal. Instead, they are all about the images behind the landscape and meanings beyond what is expressed,     10    is the so-called “view borrowing”.

Antarctica is one of the last real wildernesses     1     (leave) on the earth. Since it was first explored in the late 19^th and early 20^th centuries, various countries     2     (try) to use it for different purposes.

However, in 1961, 12 countries agreed to sign the Antarctic Treaty. This means that the entire area was     3     nuclear-free zone and could only be used for     4     (peace) purposes. Antarctica became the biggest laboratory in the world, with many scientists     5     (conduct) research there. Today 42 countries have signed the treaty, and have sent scientists to study in the area. Every summer, 3,000 scientists arrive to carry out a variety of research     6     (project).

Unlike the Arctic in the north,     7     is just made up of ice, Antarctica is an actual land mass. In fact, it is one     8     (ten) of the land surface of the earth. Over 140 million years ago, Antarctica was a green and living place. However, the land mass     9     (gradual) moved to the colder areas in the South, and now it is just as frozen as the Arctic.

Tourism has finally reached the great frozen wilderness. People come to see the local bird life, to go mountaineering, or to visit the South Pole.     10     we are not careful, it will not remain a wilderness for much longer.

Jingdezhen porcelain(瓷器)is Chinese porcelain produced in or near Jingdezhen in southern China. Jingdezhen has produced porcelain     1     (century)ago. And the town     2    was named Jingdezhen by Emperor Zhenzong of the Northern Song Dynasty became a major kiln(窑)site around 1004.During the period, the     3    (produce)of porcelain in this area first became     4    (know).By the 14th century it had become the largest centre of producing Chinese porcelain, which remained in the following times. In the Ming Dynasty, official kilns in Jingdezhen     5    (control)by the emperor, making quality porcelain in large quantities for the emperor to give abroad as gifts. As a result, the town was     6    (close)linked to the world.

Although being a remote town in a hilly area, Jingdezhen is near the quality porcelain stone and forests which can provide plenty of wood for the kilns. It also has     7    river flowing from north to south,     8    (benefit)the transport of the fragile objects.

Jingdezhen has produced a great variety of     9     (value) porcelain. As a result, the town is famous     10     the “Porcelain Capital”. One type of its well-known high quality porcelain object is the blue and white porcelain from the 1330s.

On Aug 13, four Chinese irrigation sites won global     1    (recognize) and were added to the 2018 list of Heritage Irrigation Structures, among     2     Dujiangyan is the oldest and only surviving damless irrigation system in the world.

Built over 2,000 years ago in     3     is now Sichuan Province in Southwest China，this amazing engineering achievement is still playing a crucial role in irrigating farms and providing water resources for more than 50 cities in the province.

In ancient times, the region in which Dujiangyan now stands     4    (threaten) by frequent flooding from the Minjiang River. Li Bing, a local official of Sichuan Province at that time, together with his son, decided to construct an irrigation system on the Minjiang River     5    (prevent) flooding. After many studies, they found the     6     (simple) solution was to build a dam, but this would have ruined the Minjiang River. So instead Li designed a series of     7    (channel) built at different levels along Mount Yulei that would take away the floodwater while leaving the river flowing     8    (natural). Better still, the extra water could be directed to the dry Chengdu Plain,     9    (make) it suitable for farming.

Ever since the great Dujiangyan Irrigation System was completed, the Chengdu Plain has been free     10     flooding and the people there have been living peacefully.