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2 năm trước
Tìm một số tự nhiên có hai chữ số, biết rằng nếu viết thêm chữ số 9 vào bên trái số đó thì được số mới gấp 13 lần số đã cho. làm cách dễ hiểu nhất nha, ko chép mạng
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HOT AIR BALLOON A hot air balloon is a type of aircraft. By heating the air inside the balloon with fire, it is lifted up. Hot air weights less than cold air which means that hot air will rise up or float when there is cold air around. It is just like a bubble of air in a pot of water. The balloon can carry more weight on a cold day or if the air inside the balloon is very hot. In China, they used hot air to make objects fly and the first use of the knowledge was used to send lanterns into the air for signaling. The hot air balloon is the oldest form of flying technology that successfully carried people. The first hot air balloon to carry a person was made by the French Montgolfier brothers. On September 19, 1783, they demonstrated their invention for King Louis XVI and Queen Marie Antoinette at the French court in Paris. The balloon flew for a period of 20 minutes. 1. What is hot air balloon? 2. How can hot air balloon fly? 3. In what case does a hot air balloon carry more weight? 4. What did Chinese people use hot air for? 5. How meaningful of the hot air balloon to carrying people? 6. Who made the first hot air balloon to carry a person? 7. On what days was the hot air balloon demonstrated at the presence of King Louis XVI and Queen Marie Antoinette? 8. How long did the balloon fly for?

Exercise 1: Read and complete the sentences with suitable words/ phrases in the text. LONDON TAXI Robert is a taxi driver in London. He works six days a week. He can starts and finishes his work at any time he wants, as long as he works enough hours during the day. As London is a very busy city, sometimes he works overtime on a Saturday, which is good as it means extra money. Driving a taxi is difficult and dangerous. Traffic in the city is often slow because of accidents and construction sites which drivers have to go around. When it rains or snows, the roads are very difficult to drive on. Robert sometimes never gets paid especially when he has to deal with drunk passengers. Most of Robert’s passengers are friendly and tip him generously. Robert likes his job, but lately he has been suffering with backache. He is wondering if he is old. 1. Robert is working as a ......................... 2. Robert starts and ends his work at ......................... he wants. 3. When working overtime, Robert gets ......................... 4. Taxi-driving in London is difficult and ......................... 5. Traffic in London is low because the taxi drivers have to ......................... the accidents and construction sites. 6. When Robert deals with ........................., he does not get paid. 7. Robert is tipped generously by his ......................... 8. Recently, Robert has been suffering with .........................

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