Now, please allow me to {#blank#}1{#/blank#} (introduce) Lhasa to you. Lhasa is {#blank#}2{#/blank#} capital city of Tibet, which is {#blank#}3{#/blank#} (locate) in the Southeast of Tibet. It is a city with a history of more than 1300 years. It is famous for the Potola Palace. Besides, it's also an {#blank#}4{#/blank#} (attract) city, attracting tens of millions of visitors from home and abroad each year. There are many {#blank#}5{#/blank#} (place) of interest and people  are very {#blank#}6{#/blank#} (friend). With the {#blank#}7{#/blank#} (develop) of modern transportation, traveling becomes{#blank#}8{#/blank#} (easy). It takes only 2 hours to fly {#blank#}9{#/blank#} Chengdu to Lhasa. If you have a chance to come to Tibet, welcome {#blank#}10{#/blank#} Lhasa.

    A sand storm often takes place in the northern China, {#blank#}1{#/blank#} is a kind of natural disasters. China usually experiences this kind of weather between February and May, while March and April see the most frequent and the {#blank#}2{#/blank#} (strong) sand storms. It becomes a very important environmental problem. It does damage {#blank#}3{#/blank#} the society as well as the environment. Firstly, the strong wind destroys soil and plant cover by {#blank#}4{#/blank#} (bury) fields with sand and dust. Secondly, by leaving too much dust in the air it will {#blank#}5{#/blank#}(serious) pollute the air. Thirdly, a sand storm will have {#blank#}6{#/blank#}bad effect on transportation. The dust in the air makes traffic and aircraft movements more difficult. And when the sand buries the roads, the traffic will{#blank#}7{#/blank#}(block). When plants in the farmland are buried, food supply will lose.

    Sand storms are another {#blank#}8{#/blank#}(punish) nature gives to mankind. We should not only take effective measures {#blank#}9{#/blank#}(stop) them, but also draw some {#blank#}10{#/blank#}(lesson) from them. We should not develop the economy (经济) at the cost of the natural environment.

    Yuan Longping was born in 1930.Since he graduated from Southwest Agricultural College in 1953, he{#blank#}1{#/blank#}(devote)his life to finding ways{#blank#}2{#/blank#}(grow)more and more rice. As a young man, he saw the great need for increasing the rice output. At that time{#blank#}3{#/blank#}(hungry)was a serious problem in many parts of the countryside. Yuan searched {#blank#}4{#/blank#} a way to increase rice harvests without {#blank#}5{#/blank#}(expand) the areas of the fields. In 1950, Chinese farmers could produce about 56 million tons of rice. In{#blank#}6{#/blank#}recent harvest, however, nearly 200 million tons of rice were produced. These increased harvests mean that 22% of the world's people{#blank#}7{#/blank#}(feed)from just 7% of the farmland in the world. Yuan Long Ping is now circulating his knowledge in India and many other less{#blank#}8{#/blank#}(develop)countries to increase their rice harvests.{#blank#}9{#/blank#}(thank)to his research, the UN is trying to rid the world{#blank#}10{#/blank#}hunger. Using his hybrid rice, farmers are producing harvests twice as large as before.

    For those who just love to shop online, Nov 11. is the{#blank#}1{#/blank#}(good) time of the year. Online group buying is quite popular{#blank#}2{#/blank#}the young. The main reason is that things in this way are{#blank#}3{#/blank#}(cheap) than those bought in usual stores. Then, it is convenient to {#blank#}4{#/blank#}(make) orders and pay. Besides, it is a trend and young people love following trends. {#blank#}5{#/blank#}, every coin has two sides. Online group buying has{#blank#}6{#/blank#}(advantage). It is sometimes unsafe. One of my friends was {#blank#}7{#/blank#}(cheat) once. He bought {#blank#}8{#/blank#}MP4 on a group buying site. Several days passed, he still didn't receive the MP4. He called to find out{#blank#}9{#/blank#}the problem was, and found that the site was a trick. Therefore, we must be careful when{#blank#}10{#/blank#}(do) such shopping. In addition, buy only what we need and never buy unnecessary things just because they are cheap.

    As we all know, the Great Wall of China is one of the greatest {#blank#}1{#/blank#} (sight) in the world—the longest wall in the world ,which {#blank#}2{#/blank#} (consider) the symbol of China and the wisdom of Chinese people.

    With {#blank#}3{#/blank#} long history of more than 2300 years, the "Long Wall" was built in different areas by different dynasties {#blank#}4{#/blank#} (protect) their territorial (领土的) borders. During the construction of the Great Wall, there were many {#blank#}5{#/blank#} (interest) legends and stories, such as Meng Jiang Nü weeping over the Great Wall, a sad {#blank#}6{#/blank#} romantic love story.

    Today, the Great Wall has become a place {#blank#}7{#/blank#} interest not only to the Chinese but also to people all over the world. Perhaps the most {#blank#}8{#/blank#} (wide) famous advertising words in history come from the poetic pen of Chairman Mao: "He {#blank#}9{#/blank#} has never been to the Great Wall is not a true man," Actually, since the Great Wall was opened to the public, hundreds of millions of visitors {#blank#}10{#/blank#} (be) to its various sections.

    Every year, butterfly(蝴蝶) lovers in California go out in November to count monarch butterflies. They {#blank#}1{#/blank#}(get) a worrying result from their fall monarch count in 2018—{#blank#}2{#/blank#} number of monarchs had dropped by 86% since 2017.

The orange and black monarch butterflies are famous {#blank#}3{#/blank#} their long migrations(迁徙)—they fly thousands of miles every year. In the spring and summer they fly north; in the fall they fly south again.

    Monarchs, like most butterflies, are {#blank#}4{#/blank#}(terrible) important for plants. They help create more plants by spreading pollen(花粉) between plants. In turn, monarchs depend on plants for food. And they depend completely on a plant called milkweed {#blank#}5{#/blank#}(lay) their eggs.

    But monarchs have been facing growing problems for years. As more and more wild land has been turned into large farms, the monarchs have had trouble {#blank#}6{#/blank#}(find) enough milkweed. Many farms also use chemicals {#blank#}7{#/blank#} will kill insects in order to protect their plants. These chemicals also affect monarchs. Besides, pollution has made milkweed less {#blank#}8{#/blank#}(health) for the monarchs than it used to be.

    Scientists say monarchs will be in danger of dying out in the next 20 years if nothing {#blank#}9{#/blank#}(do) to save them.

   {#blank#}10{#/blank#}(thing) that people can do to help include planting milkweed, controlling the use of chemicals, protecting wild areas, and planting trees.