Hai quả cầu nhẹ có cùng khối lượng được treo vào mỗi điểm bằng hai dây chỉ giồng nhau. Truyền cho hai quả cầu điện tích cùng dấu $q_{1}$ và $q_{3}$ =3$q_{1}$ , hai quả cầu đẩy nhau. Góc lệch của hia dây treo hai quả cầu so với phương thẳng đứng là $\alpha_{1}$ và $\alpha_{2}$. chọn đáp án đúng: A) $\alpha_{1}$=3 $\alpha_{2}$; B) 3 $\alpha_{1}$=$\alpha_{2}$; C) $\alpha_{1}$=$\alpha_{1}$; D)$\alpha_{1}$=1,5 $\alpha_{1}$ các bạn nhớ giải thích giùm mình với

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giup e voi I/ Supply the correct form of the verbs in brackets 1. You (think) ……………………… collecting stamps costs much money? 2. Every year, my mother (give) ……………………… me a nice doll on my birthday. 3. Jenny says she loves collecting pens but she (not/continue) ……………………… this hobby from next year. 4. If you wash your hands more, you (have)……………………. less chance of catching flu. 5. Getting plenty of rest is very good. It (help)…………………. you to avoid depression. 6. Mr. John (be) ……………………… principal of our school since last year. 7. I (see) ……………………… a car accident on this corner yesterday. 8. We like (come)……………………to school by bus, but we hate (stand)………………………. and (wait) …………………… in the rain. 9. ……………………… (you/ ever/ meet) anyone famous? 10. My mother (come) ……………………… to stay with us next weekend. 11. When he lived in Manchester, he (work) ……………………… in a bank. 12. We (be) ……………………… students for four years. 13. We are planting trees around our school now. Our school (be) ……………………… surrounded by a lot of green trees. 14. What ……………………… your father usually ……………………… (do) in the evenings? 15. My sister likes (cook) ……………………… very much. She can cook many good foods. 16. My father says when he's retired, he (go) …………………… back to his village to do the gardening. 17. They want (buy) ……………………… some meat for dinner. 18. Linh is my best friend. We (know) ……………………… each other for 5 years. 19. I enjoy (fish) ……………………… because it is relaxing. 20. How about (go) ……………………… to the movie theatre?

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