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Bài 1. Ở hai đầu đường dây tải điện một máy tăng thế với các cuộn dây có số vòng dây là 500 vòng và 11000 vòng. Ở cuối đường dây gần nơi sử dụng điện đặt một máy hạ thế với các cuộn dây có số vòng dây là 132 000 vòng và 1320 vòng. Hiệu điện thế đặt vào cuộn sơ cấp là 1000V, công suất tải đi là 110 000W a. Tìm hiệu điện thế ở nơi sử dụng ? b. Tìm công suất hao phí trên đương dây biết rằng điện trở tổng cộng của dây là 100 ôm. Bài 2. Một máy phát điện sản ra dòng điện có U = 25 000V. Sau đó cho qua máy biến thế có số vòng dây sơ cấp 220 vòng, số vòng dây thứ cấp 4400 vòng, sau khi qua máy biến thế 1 dòng điện được tải đến máy biến thế 2 để hạ thế và dẫn vào nhà máy công nghiệp. Hỏi sau khi qua máy biến thế 2 hiệu điện thế hai đầu dây dẫn vào nhà máy là bao nhiêu biết máy biến thế 2 có số vòng dây cuộn sơ cấp lớn gấp 50 lần số vòng cuộn thứ.

TEST 1 Find the word which has a different sound in the part underlined. 1. A. chemistry B. kitchen C. choose D. marching 2. A. short B. port C. work D. morning 3. A. know B. brown C. cow D. how 4. A. brush B. student C. bus D. cut Circle the correct answer to complete the sentences. 5. My sister_______to pop music every day. ( A. watches B. hears C. listens D. sings) 6. Water puppetry_______in 11th century. (A. begin B. to begin C. began D. begun ) 7. They_____badminton next year. ( A. will play B. play C. have played D. playing ) 8. Our hometown has changed a lot_______2010. ( A. about B. from C. for D. since ) 9. There isn’t_________beef and pork left. ( A. an B. any C. some D. a ) 10. Many trees______every year. (A. plant B. is planting C. are planted D. planted ) 11. The government had better help the _________people. A. home B. homeless C. homefolk D. household 12. You need to wear _________clothes on special occasions. A. tradition B. traditional C. traditionally D. untraditional 13. The main _______ of measles is little red spots all over your body. A. problem B. signal C. sign D. symptom 14. I don’t like rugby and John _______ like it ________. A. isn’t/either B. don’t/ either C. doesn’t /neither D. doesn’t/ either Choose the underline part that needs correction in each of the following items. 15. They (A) build (B) this (C) house many (D) years ago. 16. (A) Would you like (B) any milk (C) or fruit juice (D) for lunch? 17. He (A) finds that (B) gardening (C) is really (D) bored. Choose the word CLOSET in meaning to the underlined word in each of the following items. 18. The church was constructed by the villager 100 years ago. A. builded B. built C. visited D. fixed 19. You had better take a camera, so we can take many nice photos. A. can B. will C. ought D. should Read the text and choose the option that best fits in the blanks. It is very important to have healthy teeth. Good teeth help us to chew our food. They also help us to look nice. How does a tooth go bad? The decay begins in a little crack in the enamel covering of the tooth. This happens after germs and bits of food have collected there. Then the decay slowly spreads inside the tooth. Eventually, poison goes into blood, and we may feel quite ill. How can we keep our teeth healthy? Firstly, we ought to visit our dentist twice a year. He can fill the small holes in our teeth before they destroy the teeth. He can examine our teeth to check that they are growing in the right way. Unfortunately, many people wait until they have toothache before they see a dentist. Secondly, we should brush our teeth with toothbrush and fluoride toothpaste at least twice a day- once after breakfast and once before we go to bed. We can also use wooden toothpicks to clean between our teeth after a meal. Thirdly, we should eat food that is good for our teeth and our body: milk, cheese, fish, brown bread, potatoes, red rice, raw vegetables and fresh fruit. Chocolate, sweets, biscuits and cakes are bad, especially when we eat them between meals. They are harmful because they stick to our teeth and cause decay. 20. Good teeth help us to ________. A. be nice B. chew our food C. have good eyesight D. be important 21. When food and germs collect in a small crack, our teeth _________. A. become hard B. send poison into the blood C. begin to decay D. make us feel quite ill 22. A lot of people visit a dentist only when __________. A. their teeth grow properly B. they begin to have toothache C. they have well brushed teeth D. they have holes in their teeth 23. We ought to try to clean our teeth ________. A. once a day B. between meals C. at least twice a day D. before breakfast 24. We shouldn't eat a lot of _________. A. red rice B. fish C. fresh fruit D. chocolate

CHANGE THE SENTENCES BELOW IN TO THE PASSIVE VOICE Ex1: 21. John collects money. → …………………………………………………………………. 22. Anna opens the window. → …………………………………………………………………. 23. We do our homework. → …………………………………………………………………. 24. I ask a question. → …………………………………………………………………. 25. He cuts out the picture. → …………………………………………………………………. 26. The sheep eat a lot of grass → …………………………………………………………………. 27. We do not clean our rooms. → …………………………………………………………………. 28. William does not repair the car. → …………………………………………………………………. 29. Does Sue draw this circle? → …………………………………………………………………. 30. Do you feed the dog? → …………………………………………………………… Exercise 2 31. John collected money. → …………………………………………………………………. 32. Anna opened the window. → …………………………………………………………………. 33. We did our homework. → …………………………………………………………………. 34. I asked a question. → …………………………………………………………………. 35. He cut out the picture. → …………………………………………………………………. 36. The sheep ate a lot of grass → …………………………………………………………………. 37. We did not clean our rooms. → …………………………………………………………………. 38. William did not repair the car . → …………………………………………………………………. 39. Did Sue draw this circle? → …………………………………………………………………. 40. Did you feed the dog? → …………………………………………………………………. EXERCISE 3 7. The teacher tells a story. → …………………………………………………………………. 8. The teacher told a story → …………………………………………………………………. 9. The teacher has told a story → …………………………………………………………………. 10. Somebody has taken my books away. → …………………………………………………………………. 11. Somebody takes my books away. → ………………………………………………………………… 12. Somebody took my books away. → …………………………………………………………………. 13. They clean the wall before they paint it. → …………………………………………………………………. 14. They cleaned the wall before they painted it. → …………………………………………………………………. 15. Mr. Cole visited John at the weekend. → …………………………………………………………………. 16. Mr. Cole usually visits John at the weekend. → …………………………………………………………………. 17. Mr. Cole has visited John many times → …………………………………………………………………. 18. Science and technology have completely changed human life. → …………………………………………………………………. 19. They found the book on the floor → …………………………………………………………………. 20. They find the books in the desk → 21. They have found the keys in the drawer → …………………………………………………………………. 22. They don’t finish the work in time → …………………………………………………………………. 23. Do You finish the work in time ? → …………………………………………………………………. 24. Did You finish the work in time ? → …………………………………………………………………. 25. You finish the work in time → …………………………………………………………………. 26. They didn’t call my name. → …………………………………………………………………. 27. They don’t call my name → …………………………………………………………………. 28. They haven’t called my name → …………………………………………………………………. 29. Has she written a poem? → …………………………………………………………………. 30. Has your mother made a big cake for the next party? → …………………………………………………………………. 31. Did your mother make a big cake for the party? → …………………………………………………………………. 32. Does your mother make a big cake for the party? → ………………………………………………………………….

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