In China, Tree Planting Day falls on March 12, but more often people plant trees during Qing Ming Festival in early April. Newly-planted trees can survive more     1     (easy) with a warmer climate and frequent spring rainfall at that time.

China set March 12     2     the National Tree-Planting Day in 1979     3     (honor) Sun Yat-sen, who died on March 12, 1925. Sun had called for planting trees.

Since 2013, Xi Jinping,     4     is the president of China, has joined Beijing citizens in tree planting activities for ten years in a row. President Xi called on     5     public to stick to the tradition of planting trees in spring. In 2017, he     6     (attend) a tree planting activity in Chaoyang district of Beijing and said, “Students should establish an     7     (aware) of protecting the environment and cherish the green plants”.

China has seen a     8     (remark) growth in forest resources and afforestation (造林) projects. Nationwide voluntary tree    9     (plant) campaigns in China over the past four decades have seen increased participation by members of the public and nearly 79 billion     10     (tree) have been planted. The campaign has made China the country with the largest increase in forest resources and the largest area of planted forests.

Working with elephants is one of the most popular volunteer     1     (activity) in Thailand. And for good reason, these amazing creatures are huge, cute, and very intelligent. Often elephants     2     (view) as gentle animals, but it’s good to remember that this isn’t always the case. In the last few years, many elephants     3     (find) themselves treated badly, and they are beaten into     4     (give) performances or forced to overwork at money-hungry tourist attractions. A terribly-treated elephant can become angry and kill if it feels     5     (threaten).

All that being said, volunteering for elephant     6     (protect) can be a very rewarding experience. The important thing is to find the right opportunity. There are a number of elephant reserves (动物保护区) and parks, especially in Thailand     7     you can do meaningful work     8     (improve) the lives of elephants. The key is to do your research and watch out for places that promise you more than     9     (simple) big money.

If the volunteer organization seems to be paying attention to elephant rides and the elephants giving performances, please keep     10     mind that it is probably not a place with the elephants’ best interests.

The public nowadays has a     1     (misunderstand) of forest fires,     2     (believe) that fires should be kept out of every type of forest. Many of us can recall Smoky the Bear’s famous warning: “Remember, only you can prevent forest fires.”     3    , that’s not always the case. Under the right conditions, and when conducted safely, fire can create many environmental benefits as well as help prevent larger,     4     (control) wildfires.

After a forest fire, many wildlife species will move into     5     (recent) burned areas to feed on these newly available foods. Some reptiles and amphibians such as the pine (松树) snake prefer forests frequently     6     (burn) by fire.

If you are asked to picture the forest floor,     7     do you see? Pine needles, cones, leaves, branches might come to mind—all sources of fuel. If these fuel sources build up     8     any type of removal, the “fuel load” can lead to fires catastrophic to forests and people alike. In contrast, prescribed fire can be used by forest professionals every couple of years to keep forest fuels at an appropriate and manageable level. They can also minimize the spread of pest     9     (insect) and disease and remove unwanted tree and plant species. Plus, they can create and maintain important wildlife habitats rich in grasses and promote the     10     (grow) of trees, wildflowers and other various plants.

Giant panda Ya Ya arrived at Shanghai Pudong International Airport on Thursday from Memphis, Tennessee.

Ya Ya returned     1     China from the United States after a 20-year loan for a joint research and conservation project, according to the National Forestry and Grassland Administration.

In December, the Memphis Zoo     2    (announce) that it would return Ya Ya, who arrived in the US in 2003.

The zoo hosted a farewell party for the 23-year-old female panda on April 8, with hundreds of people     3    (attend) the event, Xinhua News Agency reported.

In January, Chinese netizens showed their concern for Ya Ya, who appeared somewhat malnourished (营养不良) in pictures and videos     4    (post).

In     5    (respond), the Chinese Association of Zoological Gardens said in     6     announcement that the zoo had taken good care of her, and there is no indication that she was neglected, based on videos of her and the results of     7    (month) health reports and annual physical examinations.

In 2006, Ya Ya began to shed fur, a condition     8     worsened in 2014.     9    (expert) at the Memphis Zoo and in China tried various forms of treatment but were     10    (able) to resolve the problem, the association said.

Some countries have a large number of earthquakes. Japan is one of them, while others do not have so many. For example, there are few earthquakes in Britain. But they are     1     (frighten) when they break out.

There is often a great noise during    2     earthquake. The ground shakes; houses fall down; railways are destroyed,     3     causes trains to stop off. Sometimes thousands of people     4     (injure) in different ways. Some people say that earthquakes often happen near volcanoes (火山),     5    this is not true. The centers of some earthquakes are under the sea. The bottom of the sea suddenly moves. The    6     (power) forces inside the earth break the rocks. The coast is shaken and great waves appear. These waves travel a long     7     (distant) and rush over the land,     8     (break) down houses and other buildings. Sometimes they damage more buildings than the earthquake     9     (it). What kind of building stays up best in an earthquake? The Americans studied carefully the results of the earthquake at San Francisco and believed it is best for buildings to be made with concrete (水泥) walls held together by steel frames (钢筋框架). Such buildings won’t burn or fall     10     (easy).

Tibetan antelopes live on the plains of Tibet, Xinjiang and Qinghai. When I     1     (watch) them move slowly across the green grass, I am struck by their     2     (beautiful). At the same time, I am also reminded     3     the danger they are in. Right now they     4     (hunt), illegally, for their valuable fur.

Zhaxi who works at the Nature Reserve (保护区) says, “    5     (actual), we are trying to save ourselves, not only the animals.” In the 1980-1990, the number of the antelopes     6     (reduce) by 50 percent. The hunters were shooting antelopes     7     (make) profits. Their habitats were becoming     8     (small) than before,     9     new roads and railways were built.

In order to save them, the government take     10     (effect) measures and the antelope population has recovered. In June, 2015, the Tibetan antelopes was removed from the endangered list.