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If you go out to the fields at night in spring or summer, you can hear frogs singing   (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 (insect). Each frog eats a large number of pests that are harmful to crops. This little creature is regarded "the natural enemy of pests".

But now frogs (get) fewer and fewer. This is because they are killed and put 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  (responsibility) for 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  (eat) poison-killed insects.

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

When Crystal was riding a bike to the local Wildlife Center last December, she was scheduled to go bird-watching. Just a mile into her walk, she saw a female 1 near the water's edge. Crystal had worked at a wild bird rehabilitation(康复) center and 2 that swans can be aggressive. But as she approached this one, it didn't 3. She was certain that the bird needed 4 attention. Crystal put her jacket over the bird's head to keep it calm, 5 picked it up and held it in her arms. And then a thought 6 her: What should I do now?

Her best7 was the rehab center, but that was on the other side of town. How was she going to transport a 17-pound swan on her 8 all that way. Luckily, some 9 driving by offered her, her bike and the swan a(n) 10 to the rehab center.

Staff members at the rehab center11 that the swan might have lead(铅) poisoning. They got the swan back up on her feet. 12, the swan had a bacterial infection. Two months after Crystal came to her 13, she passed away.

It's a(n) 14 ending, but the story shows just how far people are willing to go to 15 animals.

A young Dutch inventor is widening his effort to clean up floating(浮动的) plastic from the Pacific Ocean. He has developed a floating device(设备) to trap plastic waste moving into rivers before it reaches the oceans.

Boyan Slat was just 18 years old when he invented a system for catching waste in the ocean. He also founded an environmental group called "The Ocean Cleanup". Its purpose is to develop the system. Last year, Slat showed the next step:a floating device called Interceptor. It removes plastic out of rivers. The device is powered by energy from the sun. "The 1, 000 rivers are responsible for about 80% of plastic going into the world's oceans, " said Slat. Three of the machines have already been used. Each machine costs about $775, 660, but the cost might drop as production increases.

Since they were used, the machines have been doing very well, collecting the plastic bottles and all the rubbish in the rivers. According to Slat, it is necessary to close "the tap", which means preventing more plastic from reaching the ocean in the first place. He wanted to clean them all in the next five years. "This is not going to be easy, but if we do get this done, we could truly make our oceans again, " said Slat.

The device is designed to be safe in rivers. Its nose is shaped to change directions to keep it away from larger floating things. It works by guiding plastic waste into an opening in the front of the device. The waste is then carried inside the machine where it is dropped into containers. The device sends a text message to local operators that can come and empty it when it is full.

In some countries, the rich are becoming richer, and .

As I know, he spends at least as much time .

for a long time about a painting you weren't that interested in?

As media channels have grown in number and type, .

I wish that the sports day with some other less competitive event.

A little girl whose parents had died lived with her grandmother and slept in an upstairs bedroom.One night there was a fire in the house and the grandmother died while trying to rescue the child.The fire spread quickly,and the situation was terrible.

Neighbours called the fire department,then stood helplessly by,unable to enter the house because flames blocked all the entrances.The little girl appeared at an upstairs window,crying for help,just as word spread among the crowd that the firefighters would be delayed a few minutes because they were all at another fire.

Suddenly,a man appeared with a ladder,put it up against the side of the house and disappeared inside.When he reappeared,he had the little girl in his arms.He delivered the child to the waiting arms below,then disappeared into the night.

An investigation revealed that the child had no living relatives,and weeks later a meeting was held in the town hall to determine who would take the child into their home and bring her up.

A teacher said she would like to raise the child.She pointed out that she could ensure her a good education.A farmer offered her an upbringing(教养) on his farm.He pointed out that living on a farm was healthy and satisfying.Others spoke,giving their reasons why it was to the child's advantage to live with them.

Finally,the town's richest resident rose and said,"I can give this child all the advantages that you have mentioned here,plus money and everything that money can buy."

Throughout all this,the child remained silent,her eyes on the floor.

"Does anyone else want to speak?" asked the meeting chairman.A man came forward from the back of the hall.He walked slowly and appeared to be in pain.

注意：1.续写词数应为150左右;2.请按如下格式作答。

When he got to the front of the hall,he stood directly in front of the little girl and held out his arms.

……

When asked her choice,the girl gave people the reasons firmly.