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Thực nghiệm cho biết nguyên tố natri chiếm 59% về khối lượng trong hợp chất với lưu huỳnh . Viết công thức hóa học và tính phân tử khối của hợp chất
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Choose the best answer to fill in the blank. 6. The roof collapsed under the weight of snow. A. broke off B. put away C. pulled down D. fell in 7. The hurricane was ______, it knocked down all the houses on its way. A. destroy B. destructive C. destruction D. destroying 8. Thanks to the weather forecast, the villagers ______ before the flood ______. A. had left/ came B. left/ come C. left/ came D. had left/ come 9. During the next 24 hours, the storm will be moving north, around 10 km per hour and is expected to ______ the southeastern part of China's Guangdong Province. A. bury B. struken C. struck D. strike 10. Due to lack of rainfall, California regularly has ______ in summertime. A. tornado B. floods C. droughts D. tsunamis 11. A heavy storm swept through the village and many people ______. A. kill B. were killed C. killed D. are killed 12.When the team of rescuers arrived, the victims of the flood were provided ______ food and medicine. A. within B. without C. with D. of 13. - There will be a storm in our city. - __________________________ A. It must be an exciting and fascinating experience. B. So let's go to the beach to enjoy it. C. Safety measures should be done as soon as possible. D. I really love it.

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