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2 năm trước
Dãy chất nào sau đây tác dụng với nước tạo dung dịch làm quỳ tím hóa xanh? A. CO2, P2O5, SO3, N2O5 B. CuO, K2O, CaO, Na2O C. Fe2O3, PbO, CaO, BaO D. K2O, Na2O, BaO, CaO
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ai giúp tớ VII. Read the passage and answer these questions below: England is not a large country. No town in England is very far from the sea, and many English families spend their summer holidays at the seaside. There are no high mountains in England, no very long rivers and very large forests. There are many towns in England. No town is very far from another. The English countryside between the towns is like a carpets of many colors. In Spring and summer, the fields, meadows and forests are light green or dark green, and the gardens are green , red, blue, yellow and white with flowers. Questions 1.Is England a large country? ................................................................................................................................................. 2. Where do many English families spend their summer holidays? ................................................................................................................................................. 3. Are there many towns in England? ................................................................................................................................................. 4. What is the English countryside like? ................................................................................................................................................. VIII. Rewrite the sentences below without changing their original meaning. 1. Radioactive pollution is very dangerous. It can cause abnormal growth. [since] 2. We did not go to school. It rained heavily . [because] 3. I don’t have much money now, but I want to buy a new computer. If 4. Light pollution happens. There is a change in animals’ living patterns. If 5. Acid rain is dangerous. Trees’ leaves are damaged. [because of] I. One of the four underlined parts each sentence is not correct in Standard English. If Lucia had been here now, she would find out the truth about her uncle’s accident. .............................. If had I known you were in financial difficulty, I would have helped you. ........................................ If a student takes a course on Computer Science, it will take him four years doing the course. ................. If she had finished the work, she can go home. ........................................ Unless there had been the heavy storm, the climbers will not have died. ........................................ If I had spoken more confident at the interview, they would have offered me the job. .............................. II. Complete each sentences with the correct form of the verb in brackets (3 points) 1. Phuc enjoyed (chat) .................................................... on the phone with her friends. 2. He has decided (go) ........................................................... to work in a school in a quite remote area. 3. We’ll need (call) .....................................him more often. 4. She dislikes (communicate) .....................................through message board or online meetings. 5. I tried (explain) ......................................it to him, but he didn’t understand 7. Which TV programme (you, watch) ........................................ at 9 p.m. tomorrow? 8. They didn’t mind (work) ....................................late to complete the task. 9. He intends (stay) ........................................ there for at least three years. 10. We plan (have) .................................................a picnic this Sunday. Would you like to join us? 11. I’ll need (take) ....................................the bus to Nguyen Du Street. 12. You should avoid (use) ................................... too much shorthand in formal online communication. 13. I hope you (not work) ........................................ when I arrive at 8 p.m. today! III. Change the following sentences from active into passive form. 1. Somebody has taken my briefcase. 2. The teacher returned our written work to us. 3. She had finished her report by soon. 4. The mad dog bit the little boy. 5. The police have arrested five suspects. 6. The doctor ordered him to take a long rest. 7. I am lightening a paper. 8. A group of students have met their friends at the rail way station. 9. They didn’t allow Tom to take these books home. 10. The teacher won’t correct exercises tomorrow. 11. Marry has operated Tom since 10 o’clock. 12.This is the second time they have written a letter to us. 13. Mr. Smith has taught us French for two year. 14. They didn’t look after the children properly. 15. Nobody swept this street last week. 16. People drink a great deal of tea in England.

Câu 1: Cho đường thẳng : y = (m - 2)x + 2 (d) a, Chứng minh rằng đường thẳng d luôn đi qua một điểm cố định với mọi giá trị của m b, Tìm giá trị của m để khoảng cách từ gốc tọa độ đến đường thẳng d bằng 1 c, Tìm giá trị của m để khoảng cách từ gốc tọa độ đến đường thẳng d là lớn nhất. Câu 2: Cho đường tròn ( O;R) đường kính AB và điểm C thuộc đường tròn ( C khác A và B ) . Vẽ OH vuông góc với dây AC tại H . a, Chứng minh H là trung điểm AC và OH song song với BC b, Tiếp tuyến tại C của đường tròn ( O) cắt tia OH tại D. Chứng minh đường thẳng DA là tiếp tuyến tại A của đường tròn (O) c, Chứng minh DA^2 phần OA^2 = DH phần OH d, Tìm vị trí của điểm C trên đường tròn ( O) sao cho diện tích tam giác ADC bằng 1,5 lần diện tích tam giác ABC. Câu 3: Cho hàm số y = -x phần 2 có đồ thị là ( d1) và hàm số y = 2x + 3 có đồ thị là ( d2) a, Vẽ ( d1) và (d2) trên cùng một mặt phẳng tọa độ b, Xác định các hệ số a, b biết đường thẳng ( d3) : y = ax + b song song với (d1) và cắt (d2) tại một điểm trên trục tung. Câu 4: Cho đường tròn ( O; R) đường kính AB. Lấy điểm H nằm giữa nằm giữa hai điểm A và O. Vẽ dây CD vuông góc với AB tại H. a) Chứng minh H là trung điểm của CD và tính góc ACB b) Gọi E là điểm đối xứng với A qua H. Chứng minh tứ giác ACED là hình thoi, suy ra DE vuông góc với BC tại F c) Chứng minh HF là tiếp tuyến của đường tròn (I) đường kính EB d) Tìm vị trí của điểm H trên đoạn AO sao cho tam giác BCD đều và tính diện tích tam giác BCD theo R.

IV. Write the correct tense or form of the verbs in brackets. 1. My home town ________________ (change) a lot in the recent years. 2. Please, stop! You ________________(drive) so fast. 3. The paintings ________________(make) on Dzo paper with natural colours. 4. Yesterday I ________________(go) to the centre and ________________(see) an exhibition. 5. As soon as I ________________(finish) painting my room, I’ll paint the kitchen. 6. I ________________(be) to England three times so far. 7. The children ________________ (not be) at home last Sunday. 8. Do you think we ________________ (write) a test tomorrow? 9. Are you interested in ________________(do) community service? 10. Some teenage girls volunteered ________________ (work) at the local hospital. V. Supply the correct form of the words in brackets. 1. Avatar is probably the ______________film I’ve ever seen! (bad) 2. A dancer must throw her heart and soul into every ______________. (perform) 3. I think Men in Black 1 was as ______________as Men in Black 3. (excite) 4. Although John and Andrew look exactly alike, they act quite ______________. (different) 5. Dong Ho paintings are made with ______________colours. (nature) 6. His friends are all ______________ - they’re painters, musicians, and writers. (art) 7. He later became a famous jazz ______________playing saxophone. (music) 8. The problems seemed so small and ______________. (important)

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