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bimvhv
2 năm trước
Cho 4,4 gam hỗn hợp X gồm Mg và MgO phản ứng hoàn toàn với dung dịch axit sunfuric loãng, dư, thu được 2,24 lít khí (đktc). Khối lượng MgO có trong hỗn hợp X là
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Ex 2. Fill in "have/has" 1. During the five years, John _____ had 15 different jobs. 2. He _____ worked in a banking sector. 3. Teddy ______ been a teacher since 2004. 4. I ______ been on holiday for six days. 5. I and Kate ______ started our own company this year. 6. _____ your mother learned how to drive. 7. They ______ never been to Madrid. 8. ______ you ever met anyone famous? 9. We _____ been married for two years. 10. Jude ______ not seen my new address. Ex 3. Fill in "since/for" 1. She's lived here ______ 1975. 2. He's been in London ______ five days. 3. They haven't been used _______ many years. 4. She's been working ______ nine this morning. 5. I haven't eaten _______ hours. 6. It has been raining ______ ages. 7. India has been independant ______ 1947. 8. They have been married ______ October. 9. How many years is it ______ you graduated from junior high school? 10. We have been waiting ______ twenty minutes. 11. I have been a teacher ______ 30 years. 12. Bob has worked in that import-export company ______ he was 20. 13. I have studied English ________ four years. 14. Jenny has eaten five hamburgers ______ 7 pm. 15. My parents have been married ______ twenty years. 16. I have known my best friend _______ I met him at high school. 17. They have traveled in the USA _______ one month. 18. The boys have played tennis _______ two hours. 19. Kevin has been in Greece ______ July. 20. My brother has drunk beer _______ two hours.

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