Trong 1 giờ vòi thứ nhất chảy được 1/4 bể nước; vòi thứ hai chảy được 2/7 bể nước. Hỏi vòi nào chảy nhanh hơn và 1 giờ chảy nhanh hơn được bao nhiêu phần bể.

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II. Complete the sentences with the correct tense or form of the verbs in the box. bury collapse erupt put out evacuate shake scatter rage strike rescue 1. Scientists believe the volcano may_________ any day now. 2. The storm _________ outside while we were partying inside. 3. Firefighters are still trying_________ wildfires that have already burned more than 1.6 million acres of tropical forest. 4. The magnitude 6.7 earthquake_________ Japan’s Hokkaido island in September, 2018. 5. Three houses_________ in a landslide that took place this morning. 6. 8,000 people had to be from their homes as floodwaters flowed through the main streets. 7. Most deaths occur during an earthquake when buildings_________. 8. The well-trained team_________ everyone after the avalanche. 9. Right now, the building_________ so violently I can’t even stand up. 10. The town experienced flooding while strong winds_________ debris across the streets. III. Use the correct form of the words in brackets. 1. Earthquakes cause the ground to move and shake_________. (violent) 2. Rescue experts can identify_________ victims with modern methods. (bury) 3. Mount Mayon volcano caused a major_________ in the Philippines. (erupt) 4. Volcanic tremor is the rhythmic ground_________. (shake) 5. Despite all the modern technology available to us, we’re still_____ against earthquakes. (help) 6. The remove of_________ debris can be rapidly finished by machines. (scatter) 7. Indonesia orders immediate_________ as highest alert issued for Bali volcano. (evacuate) 8. We assisted them with the_________ of food and clothing. (provide) 9. Linda was the most_________ typhoon to ever hit Southern Vietnam. (destroy) 10. Medical_________ were sent to the earthquake victims yesterday. (supply)

A. Read the text carefully, then do the tasks.(6MS) Vietnam usually has a dozen storms every year from June through the end of November, and most of which occur in the Central and northern provinces. November 2nd, 1997, however, was an unexpected day when the major storm Linda raged in the South. Linda was the worst typhoon in Southern Vietnam over 100 years. Formed in the sea of the Philippines, Linda strengthened as it moved westward. Later, it struck extreme Southern Vietnam with winds of 100 kilometres an hour. Over 3000 people were reported lost and died. Ca Mau province, suffered a direct hit by the storm, had the most damage. Gusts and heavy rainfalls caused flooding, destroyed crops, damaged about 200,000 houses and left about 383,000 people homeless. Linda later struck Thailand, causing flash flooding and at least 164 deaths. The storm also affected Myanmar, Indonesia, Malaysia, and Cambodia to a lesser degree. Today, residents in Mekong Delta still remember Linda after 20 years. The duration of the time is enough for a kid to grow up from an unforgettable event. The memory of a particular typhoon improves everyone’s awareness of natural disasters. B. Decide whether the following sentences are true (T) or false (F).(3MS) 1. The tropical storm Linda hit northern Vietnam on November 2nd, 1997. 2. Linda was the worst typhoon in Vietnam for the last 100 years. 3. From the Philippines, the storm moved west and struck Southern Vietnam with winds of 100 km/h. 4. Approximately 3,000 people were killed during the disaster. 5. Ca Mau province was directly affected by the typhoon. 6. Typhoon Linda caused extensive damage to both property and human