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2 năm trước
nung 1 mẩu thép có khối lượng 10 g trong khí O2. Khí CO2 sinh ra được dẫn vào dd Ca(OH)2. phản ứng xong thu được 0,7g kết tủa. tính hàm lượng phần trăm của Cacbon trong thép đó.
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1. He usually ......very hard, but he....at, all today because it's holiday (work, not work) 2. Look! That man .........out of the bank! and he....a large bag full of money!(run, carry) 3. I don't mind babysitting for you. Your baby never...(cry) 4. Every time he....a photo, his hand...., and his photos never........good(take, shake, look) 5. " Can you come out for a drink with us later ?" "Sorry I.....Lisa with her work, and it'll take us hours to finish it." (help) 6. She usually ....a BMW but today she......her husband's Volvo (drive, drive) 7. "Where do you live?" "Normally I......in Paris with my parents, but all the moment, I.....in London, so I.....with an English family"( live, study, live) 8. I....you...because you.....out of the window(know, not listen, look) 9. Julia.....five languages fluently, and at the moment she ....as a translator( speak, work) 10. I.....three pullovers in winter because I always....cold(wear, feel)

Exercise 8. Combine the sentences using an appropriate coordinating conjunction in the box. 1. Eat more fruit and vegetables. I want to be fitter and healthier. A. I want to be fitter and healthier , so I eat more fruit and vegetables. B. I want to be fitter and healthier , but I eat more fruit and vegetables. C. I want to be fitter and healthier , or I eat more fruit and vegetables. D. I want to be fitter and healthier , and I eat more fruit and vegetables. 2. You have a sunburn. You don’t wear a sun hat A. You have a sunburn, so You don’t wear a sun hat. B. You have a sunburn, but You don’t wear a sun hat. C. You have a sunburn, or You don’t wear a sun hat. D. You have a sunburn, and You don’t wear a sun hat. 3. You may have an allergy. Be careful with what you eat and drink. A. Be careful with what you eat and drink, so you may have an allergy. B. Be careful with what you eat and drink, but you may have an allergy. C. Be careful with what you eat and drink, and you may have an allergy. D. Be careful with what you eat and drink, or you may have an allergy. 4. Tom has a temperature. Tom has a sore throat. A. Tom has a temperature, and he has a sore throat. B. Tom has a temperature, so he has a sore throat. C. Tom has a temperature, but he has a sore throat. D. Tom has a temperature, or he has a sore throat. 5. You are catching flu. You don't wash your hands very often. A. You are catching flu, or you don't wash your hands very often. B. You are catching flu, and you don't wash your hands very often. C. You are catching flu, so you don't wash your hands very often. D. You are catching flu, but you don't wash your hands very often.

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