instruction:
The task is about reading the given story and question, then finding an answer to the given question. Based on the passage provided and the given question, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.
question:
story: CHAPTER XXV 

PERILS OF THE FLOOD 

"Dave! Dave!" yelled Ben, as he saw our hero disappear into the swiftly-flowing river. "Look out, or you'll both be drowned!" 

"What's the trouble?" yelled Jerry Blutt, as he turned back for the first time since leaving the island. 

"Buster slipped in, and Dave went after him," answered Ben. "Oh, what shall we do?" he went on, despairingly. 

"Here--we'll throw out the rope!" answered the camp-worker, and took from his shoulder a rope he carried. 

In the meantime Dave had come up and was striking out with might and main for his chum. Our hero realized that Buster must be hurt, otherwise he would swim to save himself. 

"Must have struck on his head, when he went over," he thought, and he was right, poor Buster had done just that and now lay half-unconscious as the current swept him further and further from his friends. 

It was too dark to see much, and Dave had all he could do to keep in sight of the unfortunate one. But presently the stout youth's body struck against a rock and was held there, and our hero came up and seized the lad by the arm. 

"Buster! Buster!" he called out. "What's wrong? Can't you swim?" 

"Hel--help me!" gasped the fat youth. "I--I got a knock on the head. I'm so--so dizzy I do--don't know what I--I'm do--doing!" 

The current now tore Buster away from the rock, and he and Dave floated along on the bosom of the river for a distance of fifty yards. It was impossible to do much swimming in that madly-rushing element and Dave wisely steered for shore. He continued to support his friend, who seemed unable to do anything for himself. , question: what was Ben's concern?
answer:
they'll both drown


question:
story: When we talk about red packets, the most important question is "What are you going to do with it?" One thing you could do is to put your money in the bank. Maybe you don't know, some students in Hubei began to use the Xiaogui Dangjia bank card this year. This is a card for children. It is from China Minsheng Bank in Wuhan. Wang Ming is a 14-year-old junior student in Wuhan. He said "All my pocket money has a place to go now. I can pay my own school fees ." Zhu Yu, a manager of Minsheng Bank, said that they knew lots of students who didn't know how to use their money. So they wanted them to know how to use it carefully. Parents worry that children don't know how to take care of the money by themselves. Shen qiangqiang's mother like the card very much. Shen was asking his mother for a computer for a long time, but his mother didn't buy it for him. She said, "We want him to use his card to save money for the computer. If we buy everything he asks for, he will think money comes too easily, and he won't work hard for it." Today, there are many different kinds of bank cards. They are from different banks. People put their money in them. Then they can use their money at any time. People can do many things with bank cards. They can wash cars, go shopping, eat delicious food and travel to other places with the money in their bank cards. The most important thing is not "How much did you get?" It is necessary for everyone to learn how to save your money and use your money correctly., question: What did his mother say would happen if they bought everything for him?
answer:
he will think money comes too easily


question:
story: Berlin is the capital and the largest city of Germany as well as one of its 16 constituent states. With a population of approximately 3.7 million, Berlin is the second most populous city proper in the European Union and the seventh most populous urban area in the European Union. Located in northeastern Germany on the banks of the rivers Spree and Havel, it is the centre of the Berlin-Brandenburg Metropolitan Region, which has roughly 6 million residents from more than 180 nations. Due to its location in the European Plain, Berlin is influenced by a temperate seasonal climate. Around one-third of the city's area is composed of forests, parks, gardens, rivers, canals and lakes. 

First documented in the 13th century and situated at the crossing of two important historic trade routes, Berlin became the capital of the Margraviate of Brandenburg (14171701), the Kingdom of Prussia (1701–1918), the German Empire (1871–1918), the Weimar Republic (1919–1933) and the Third Reich (1933–1945). Berlin in the 1920s was the third largest municipality in the world. After World War II and its subsequent occupation by the victorious countries, the city was divided; East Berlin was declared capital of East Germany, while West Berlin became a de facto West German exclave, surrounded by the Berlin Wall (1961–1989) and East German territory. Following German reunification in 1990, Berlin once again became the capital of all of Germany., question: What rivers is it located on?
answer:

the rivers Spree and Havel


