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Thaoca161
2 năm trước
Chứng tỏ rằng : a) Tổng của ba số nguyên liên tiếp chia hết cho 3. b) Tổng của năm số nguyên liên tiếp chia hết cho 5. c) Tổng của n số nguyên lẻ liên tiếp chia hết cho n.
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1. I am .................... that my teacher helps me improve my English quickly. A. grateful B. afraid 2. She was very .................... that he didn’t keep his promise. A. helpful B. disappointed 3. Tuan is .................... that his parents live happily together. A. angry B. glad 4. They are not .................... that they have to pay much money to buy food. A. happy B. unhappy 5. My sister was .................... that her boyfriend was too late to pick her up. A. angry B. delighted 6. Everyone is .................... that we won the first prize. A. amazed B. unlucky 7. I am .................... that I am Vietnamese. A. important B. proud 8. He is .................... that his child waters the tree every morning. A. pleased B. sad 9. We were .................... that we missed the last bus. A. thankful B. worried 10. I am .................... that I sincerely believe in what people say. A. wrong B. interesting 11. He was .................... that she didn’t tell his parents about the accident. A. grateful B. true 12. The teacher is very .................... that her students are very hard-working. A. delighted B. afraid 13. I’m not .................... that a robber can do everything to rob money or properties. A. unhappy B. surprised 14. She is .................... that her English result is not bad. A. relieved B. disappointed 15. He was .................... that he didn’t suffer any side effects of drug overuse. A. frightened B. lucky

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