Sarek’s mountains used to be covered by vast sheets of ice. Around 9,000 years ago, this ice melted,     1     (leave) behind about 100 glaciers. Soon after, reindeer began to arrive. Following the reindeer were the Sami people, who made this territory their home. Getting here is quite difficult,     2     apart from the Sami very few people have ever seen Sarek. In 1909, Sarek was made a national park in order to keep the land in its natural state. Though the Sami are allowed to continue their traditional way of life in the park, no one else can live here, and all new development     3     (ban) within park boundaries. At the far side of the valley, an ancient Sami cottage is visible. Close by, there are a few reindeer     4     (feed) on grass.

Recycling paper is a great way to help the environment, but reusing things made from paper is even better. Take a copy of magazine, for example. Once you finish     1     (read) it, don’t put it in your recycling bin. Instead, consider sharing it with people     2     haven’t read it, or giving it to your school library so that your classmates can take a look. Maybe, you could find a completely     3     (difference) use for the magazine’s pages. Some readers have used them to wrap gifts for their friends and family.

Earth Day is an event    1    (annual) celebrated on April 22.     2    (found) by Senator Gaylord Nelson, an American politician and environmentalist, it was originally aimed at helping the public to know the current situation of air and water pollution and    3     (get) people to care about the earth.

In1962, Rachel Carson’s bestselling book “Silent Spring” created an    4    (aware) of the dangerous effects of pesticides (农药) . Then, a fire,     5     broke out in 1969 on Cleveland’s Guyahoga River, shed light on the problem of chemical pollution in water. Senator Gaylord Nelson dreamed of    6    similar large event that would get people to take environmental issues seriously. In 1969, he was inspired by protests against the Vietnam War and came up with the idea for Earth Day.

In the fall of 1969, Nelson announced it and appealed to the entire country to get involved. Consequently, telegrams, letters and telephone calls    7    all over the country poured in. Since 1970, Earth Day celebration have grown. Later, Nelson    8    (award) the Presidential Medal of Freedom in recognition of his work.

Today, Earth Day is celebrated around the world every April 22. Sometimes numerous communities celebrate Earth Week, an entire week of    9    (activity) focused on the Environmental issues. In 2017, the March for Science    10    (occur) on Earth Day(April 22, 2017) and was followed by the People’s Climate Mobilization (April 29, 2017).

The 1975 film Jaws was a great success,    1     (attract) huge audiences and winning many awards. People have always been     2     (scare) of sharks, but Jaws made things worse. Many people     3     saw the film considered sharks as bad animals. Some even began to fish for sharks. As     4     result, the number of sharks fell quickly. This was not only due to fear of sharks,    5     also finning. After finning, the sharks     6     (throw) back into the sea where they die painfully. In 1980, Peter Benchley came across an awful sight. He     7     (admit) that his book was wrong about sharks’    8     (behave).    9     (fortunate), more people become interested in sharks now, and they want     10     (protect) them from extinction.

At 3:42 a.m. everything began to shake. It seemed     1    the world was     2    an end! Eleven    3     (kilometer) directly below the city the greatest earthquakes of the 20th century began. It was heard in Beijing, which is one hundred kilometers away. One-third of the nation felt it. A huge crack (裂缝)    4     was eight kilometers long and thirty meters wide cut     5    houses, roads and canals. Steam burst from holes in the ground. Hard hills of rock    6    (become ) rivers of dirt. In fifteen terrible seconds a large city lay     7     ruins. Two-thirds of the people     8     (die) or were injured during the earthquake.

Thousands of families were killed and many    9     (child) were left without parents.     10    number of people who were killed or injured reached more than 400,000.

The earth’s plants     1     animals become endangered every day. And many of them are     2     (die) out. If nothing is done, we may find     3     (our) alone on the earth.

Wild animals live in the forests     4     are being destroyed by people. As a result, the animals are losing their habitats. Besides, animals are short of food because of     5     (pollute). Even     6     (bad), buying leads to killing, too.

I suggest that measures should be taken     7     (protect) wildlife. First, we can try to raise people’s awareness to love animals, for they are our     8     (friend). Then the government should make laws, if someone hunt, they must     9     (punish). If we do so, I am sure humans can live in harmony     10     animals.