It is discovered that the birds that people value most are endangered     1     climate change. In the Guanacaste region of Costa Rica, we spent four years identifying and     2     (count) birds in a range of landscapes and habitats. Then, we     3     (ask) hundreds of people in all those places — farmers, birdwatchers, people in cities — to rank the birds we had counted.

The birds that people rank highest are     4     (general) found in rainforests, with their ecosystems most     5     (threaten) by climate change. In this particular part of the world, we're seeing the drought period get longer and the rainy season get     6     (short) in certain years. Climate is becoming more unpredictable. As the forest dries out, the     7     (condition) for birds are becoming more extreme. For one thing, if trees don't get enough water     8     (grow) their leaves in the rainy season, then birds and other animals struggle to find enough food and nesting material for their breeding season. In the future, we predict that rainforests will become dry forests,     9     means we may be seeing less of those birds. That's not only     10     loss for biodiversity but also for people's history and culture.

The death toll from a powerful typhoon sweeping across China’s east coast rose to 30 on Sunday, with     1     least 18 still missing, after torrential downpours forced more than 1 million    2    (leave) their homes, the state news media reported.

    3    (Near) 5 million people in Zhejiang province have been affected by the storm, Typhoon Lekima,     4     made landfall early Saturday, according to the reports. Many of the deaths occurred in Yongjia County, near the city of Wenzhou, when the collapse of a natural dam set off a flash flood that swept away several people, said CCTV.

The typhoon, which packed winds of up to 116 mph, caused major travel disruptions across the region,     5    (include) in Shanghai, with thousands of flights canceled and train operations suspended. Shanghai Disneyland was closed on Saturday.

In Zhejiang, the typhoon damaged more than 400,000 acres of crops and 34,000 homes, amounting to economic losses of more than $2.2 billion, said Xinhua News agency, citing provincial authorities.

Officials in the city of Linhai, near Taizhou, said on Sunday that the typhoon    6    (cause) the worst flooding there in the 70-year history of the people’s Republic of China, with water levels as high as 36     7    (foot) causing major power failures. State news reports showed people wading through waist-high water in the centuries-old city’s narrow alleyways.

Lekima, China’s     8    (nine) typhoon of the year, is expected to make     9     second landing on Sunday evening farther north in Shangdong province, the state news media said. More travel disruptions are     10    (like).

What would happen if all of Earth’s ice melted? As Earth gets    1    (hot) every year, the planet’s ice suffers. The ice is melting faster than ever. Sea ice is    2    (main) in the Arctic. This kind of ice is made of salty seawater. Land ice is mostly in Greenland and Antarctica,     3    is made of fresh water. Sea levels will rise to 50 to 85 meters,     4    (cause) many global changes.     5    (city) near the sea will disappear. Sea animals will have no homes. Earth will move around more slowly. We will have longer days because two milliseconds    6    (add) to each day. Global temperature will rise by 3.5℃. Poisonous chemicals from some ice will go into rivers and oceans.

Only 30 percent of water on Earth is fresh,     7    about 70 percent of that is     8    (freeze). That’s 30 million cubic km of ice. Using this kind of ice     9    (build) a 1000- meter-thick wall,     10    would cover North America.

5 . Polar bears are suffering in a       1    (warm) world.

Polar bears live in environments too cold for most animals.    2    much of the year, they live and hunt on the frozen Arctic sea ice. Nature has prepared     3    for the cold conditions. But nothing has prepared the bears for the danger that     4     (threat)the only home they know.

The polar bears’ world is melting. Studies show that the polar ice has reduced by 9.8% every 10 years     5     1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their     6     (survive). “The sea ice is more than just this platform that the bears walk over,” says Andrew Derocher,     7     scientist who studies North American polar bear populations. “    8     it, they can’t exist.”

Some melting and refreezing of the polar ice is natural.     9     in a warmer world, these cycles speed up, and bears have less time to hunt. Normally, they have three months in the spring when they gain more weight. The extra fat is used later,      10     the bears are not actively hunting.