At 8,844.43 meters high, Mount Qomolangma is     1     (tall) mountain on Earth. While     2     is famous for its challenging hike, parts of the mountain are facing a problem: garbage. Every year, thousands of     3     (visit) throw away tons of trash, including soda cans (罐) and plastic bags.

According to the UN, over 140 tons of trash have been left on the mountain. To reduce trash, China is limiting the number of people     4     can climb the mountain’s north side. Only 300 people will     5     (allow) to climb it each year, and only during spring.

Local residents cleaned the mountain last year,     6     (remove) trash at a height of 5,200 meters. They     7     (collect) about 8.4 metric tons of trash, according to figures from the Tibet autonomous region’s government (西藏自治区人民政府).

This year, the local government plans to spend 4 million yuan       8    a new clean-up campaign, setting up stations to sort, recycle and break down garbage collected from the mountain.

In addition to trash, workers will also collect the bodies of     9     (die)   climbers. As of the 2019 climbing season, more than 300 people have died on Qomolangma, with 12 deaths this year.

A group of artists will try to turn some trash into artwork. They will show these works     10     (local), to remind people not to leave trash when climbing the mountain.

Pollution takes away all the beauty of the beaches of Hawaii. I hate to go to the beaches on       1     (sun) weekends and see rubbish bags lying on the sand, cigarette butts(烟头)     2     (bury) in the sand, and soda cans floating in the ocean.

One thing that really annoys me is that I see     3     (tour)who visit Hawaii leave their rubbish on the beaches. I was always taught after drinking soda to throw the can into the place     4     it should stay—the trash can. Another thing that annoys me is that some people walk right by rubbish     5     pretend that it’s not there.

The dogs or the fish are not to blame     6     it. It’s our fault and we must blame     7     (we). Everyone has to do his or her part     8     (solve) this problem. It can’t be difficult to do the job. There are a lot of things that we can do. First of all, we can help pick up rubbish along the beaches. We could also form organizations that help clean up our beaches. More     9     (important), we need to start now before the beaches     10     (damage) beyond repair.

Diets have changed in China — and so too has its top crop. Since 2011, the country     1    （grow）more corn than rice. Corn production has jumped nearly 125 percent over     2     past 25 years, while rice has increased only 7 percent.

A taste for meat is     3     (actual) behind the change: An important part of its corn is used to feed chickens, pigs, and cattle. Another reason for corn's rise: The government encourages farmers to grow corn instead of rice     4     (improve) water quality. Corn uses less water     5     rice and creates less fertilizer(化肥) runoff. This switch has decreased     6     (pollute) in the country's major lakes and reservoirs and made drinking water safer for people.

According to the World Bank, China accounts for about 30 percent of total     7     (globe)fertilizer consumption. The Chinese Ministry of Agriculture finds that between 2005—when the government     8     (start) a soil-testing program     9     gives specific fertilizer recommendations to farmers - and 2011, fertilizer use dropped by 7.7 million tons. That prevented the emission(排放) of 51.8 million tons of carbon dioxide. China's approach to protecting its environment while     10     (feed) its citizens "offers useful lessons for agriculture and food policymakers worldwide." says the bank's Juergen Voegele.