Một canô xuôi dòng một quãng đường dài 24km rồi ngược dòng mất 3h20ph. Nếu cũng trên quãng đường đó canô xuôi dòng 18km và ngược dòng 6 km thì mất 1h30ph. Tính vận tốc của canô so với nước và vận tốc của dòng nước so với bờ.

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Task 1:Choose the best heading for each paragraph. (2 points)(Chọntiêuđề đúngnhấtcho mỗi đoạnvănphíadưới). List of headings: A. Raising money. B. Providing street children with food. C. Helping repair things. D. Helping people with transportation. E. Tutoring poor children Paragraphs: 1. _______________________ There are many unlucky children who don’t have a chance to go to school. Therefore, we can help them by donating books, notebooks, pens, and other school things. Moreover, we can also give evening classes to these children. It is great for us to see how happy the children are when we teach them something new and interesting. 2. _______________________ Sadly, many people in the world don’t have enough food, especially street children. They always feel hungry and weak. To deal with this, we could cook nutritious food and bring it to them. I make sure that they will feel very happy when they get a free breakfast, lunch or dinner. 3. _______________________ Today, there are many ways to help the poor or the disabled, but I think that the best way is donating money. Firstly, we could collect waste paper orplastic bottles and sell them for money. Secondly, we could also sellhandmade postcards on Facebook with a message: “Please buy these beautiful postcards. Each of them only costs 10.000 VND. All of the money will be donated to the poor in my village. Thank you for your help!” 4. _______________________ We can help the old rebuild their houses and fix the roofs. Besides, we also can help them repair the household appliances, such as: a refrigerator or a television set. 5. _______________________ Many people do not own a motorbike, a car, or even a bike. So, we couldprovidethe disabled and the poor with free bus tickets. We can alsogive elderly people a lift or take them across the road. Helping other people makes us feel happy and proud of ourselves.