As a nature photographer, my favorite place to take photos is Yellowstone National Park, which is famous for the     1     （various）of its wildlife but it is     2     （probable）best known     3     its bears. Last spring in Yellowstone, I followed a path     4     took me through a dark forest. When I finally     5     （step）out of the trees, the view was breathtaking.     6     eagle flew over the snow-capped mountains, which were reflected in the still lake below. While I was concentrating on     7     （photograph）this amazing scene, I suddenly had a feeling that I was being watched. Slowly and with the camera still held to my eye. I turned and froze. Only     8     （meter）away from me was a bear. Time stood still as the bear and I both waited to see who would move first. My legs started shaking. Somehow I forced my finger     9     （press）the button. A second     10     （late）, the bear turned and ran back into the forests.

If you go out to the fields at night in spring or summer, you can hear frogs singing    1     (happy) here and there. It seems as if they were performing a field group singing.

The frog is a good and useful creature that benefits human beings. They can catch fast-moving    2     (insect). Each frog eats a large number of pests ( 害 虫 ) that are harmful to crops. This little creature is regarded     3     “the natural enemy of pests”.

But now frogs    4     (get) fewer and fewer. This is because they are killed and put    5     the table as a delicious dish by their chief enemy, human beings. It is a shameless and cruel act, isn’t it?

The cause that is    6     (responsibility) for the rapid reduction of frogs is that farmers use insect killer to kill pests and frogs get killed as a result of drinking poisoned water while    7     (eat) poison-killed insects.

Something must be done as soon as possible     8    (save) frogs. If we don’t punish those       9    sell and kill frogs to make money, then one day all of us    10       (punish) by nature for failing to keep them.

Like millions of other people, Mr Griffin, who is head of IT for marketing agency Rise at Seven,     1    (get) his own dog during the pandemic.

With most of us     2     (work) from home at the time of lockdowns, there was    3    sharp increase in pet ownership as people wanted companionship (陪伴). As bosses require staff to return to the office    4    least a few days a week, having a pet dog can become a problem. You have to find a friend or relative     5    (look) after it, or pay for expensive doggie day care. Or even try to get a new job    6    allows you to continue to work from home all the time.

    7    was to help employees such as Mr Griffin more easily return to the office after the pandemic that Rise’s bosses decided to let everyone bring in their dogs. Mia King, one of the firm’s    8     (executive), says that having dogs at work has actually made staff work harder,     9     than being a distraction (使人分心的事物). Dogs make everyone happy, and cheery staff are    10     (productive) anyway.

Rivers are one of our most important natural resources. Many of the world’s great cities     1     (locate) on rivers and almost every country has at least one river     2     (flow) through it, which plays     3     important part in the lives of its people.

Since the beginning of history, people     4     (use) rivers for transportation. The Yellow River and Changjiang River play a large role in China. The Mississippi, the     5     (long) one in the United States, ever influenced the American people     6     (great) in history. The lifeline of Egypt is the Nile. Rivers provide freshwater     7     (drink), grow crops, make electricity and chances to have fun for those     8     live along their banks.

    9     the cites growing in size, the river water is severely being polluted. It urges all countries to make     10     (decision) and take immediate action to stop it from being polluted any more.

If you go out to the fields at night in spring or summer, you can hear frogs singing     1    (happy) here and there. It seems as if they were performing a field group singing.

The frog is a good and useful creature that benefits human beings. They can catch fast-moving     2     (insect). Each frog eats a large number of pests (害虫) that are     3     (harm) to crops. This little creature is regarded as “the natural enemy of pests”.

But now frogs     4     (get) fewer and fewer. This is     5     they are killed and put on the table as a delicious dish by their chief enemy, human beings. It is a shameless and cruel act, isn’t it?

The cause that is responsible     6     the rapid reduction of frogs is that farmers use insect killers to kill pests and frogs get killed as a result of drinking poisoned water while     7     (eat) poison-killed insects.

Something must be done as soon as possible     8     (save) frogs. If we don’t punish those     9     sell and kill frogs to make money, then one day all of us     10     (punish) by nature for failing to keep them.

The Amazon is key    1    the health of the entire planet. It is the largest rainforest in the world,     2     (rough) half the size of the United States. Statistics show that nearly 20% of the oxygen     3     (produce) by the Earth’s land comes from the Amazon rainforest. It also puts an enormous amount of water into the atmosphere at a time     4     cities are drying up. The Amazon is sucking in carbon and greenhouse gases while slowing the rising temperatures.     5     it’s now burning at a record rate— with images from space     6     (show) the smoke covering much of Brazil.

It’s not the only major forest in danger. Nearly half of the world’s forests that     7     (stand) when humans started farming are now gone. The chief reason is the     8     (expand) of agriculture into forested areas. In Brazil it’s cattle ranching, soy production and logging, according to Nigel Sizer, tropical forest ecologist. “It is responsible for 80% to 90% of     9     loss of tropical forests around the world.” Environmental groups say these activities can     10     (slow) in a much more sustainable way.