khối lượng riêng ,trọng lượng riêng của một vật có thay đổi theo nhiệt độ không? Tại sao?

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3. My father was in Ha Noi three weeks ago. . .......................................................................................................................................... 4. Nam played badminton with Minh. . .......................................................................................................................................... 5. She went to the doctor because she had a backache. . .......................................................................................................................................... 6. The students are practicing their English at the moment. . .......................................................................................................................................... 7. He had an appointment at 10.30. . .......................................................................................................................................... 8. They travelled to the USA by plane last month. . .......................................................................................................................................... 9. No. I don’t really like cartoons. I prefer movies. . .......................................................................................................................................... 10. I’d love to. I really like pop music. . .......................................................................................................................................... III. Change into negative and interrogative form: 1. Her mother wrote a sick note for her. . .......................................................................................................................................... . .......................................................................................................................................... 2. Nam was absent from school yesterday. . .......................................................................................................................................... . .......................................................................................................................................... 3. I had a bad cold two days ago. . .......................................................................................................................................... . .......................................................................................................................................... 4. Many students caught flu last month. . .......................................................................................................................................... . .......................................................................................................................................... 5. They were happy with their life. . .......................................................................................................................................... . .......................................................................................................................................... 6. He suggested going out for dinner. . .......................................................................................................................................... . .......................................................................................................................................... 7. I was busy last Sunday. . .......................................................................................................................................... . .......................................................................................................................................... 8. We enjoyed our summer vacation. . .......................................................................................................................................... . .......................................................................................................................................... 9. Children should spend little time playing video games. . .......................................................................................................................................... . .......................................................................................................................................... 10. We often play table tennis together. . .......................................................................................................................................... . ........................................................................................

giúp e cần gấp đáp án chuẩn nha WHO declares coronavirus a public health emergency of international concern. ….(1)…. , the public should do "what you do every cold and flu season," said Dr. John Wiesman, the health secretary in Washington State - where the first US case of Wuhan coronavirus was confirmed. That includes washing your hands often with soap and water ……(2)….. at least 20 seconds. If you're the one feeling sick, cover your entire mouth and nose when you cough or sneeze. But don't use your hands. Use either your bent elbow or a tissue that you …..(3)…… immediately afterward. WHO also recommends staying at least 3 feet or 1 meter away from anyone …(4)…. may be infected. Patients can be treated and may recover from their symptoms, but there is no known cure for the novel coronavirus yet. Scientists are working ……(5)…..a vaccine, but don't expect it anytime soon. The US National Institutes of Health is trying to develop one, but says it will …..(6)….at least a few months before clinical trials start and more than a year until a vaccine might actually become available. Separately, scientists in Texas, New York and China are also trying to create a vaccine, said Dr. Peter Hotez, a vaccine scientist at Baylor College of Medicine in Houston. But the challenge is daunting, Hotez said. "The lesson we've learned is coronavirus infections are serious and one of the newest and biggest global health threats. 1.A.in details B.in general C.in particular D.in spite of 2.A.since B.in C.for D.before 3.A.do away B.get away C.go away D.throw away 4.A.which B.who C.when D.whose 5.A.on B.out C.over D.up 6.A.waste B.spend C.take D.make