31. They (prepare) _______________ the Christmas dinner at the moment. 32. George (work) ________________ at the university so far. 33. She (learn) __________________ German for two years. 34. Look! That man (try) ________________ to open the door of your car. 35. Listen! They (learn) _______________ a new song. 36. David (repair) _____________ the TV set at the moment. He (work) _______________ at it for one hour. 37. I ________________ can't go with you because I (not finish) _________________ my homework yet. 38. John (wash) _______________ his hands now. He just (repair) __________________ the bike. 39. I (work) _______________ at my report since Monday. Now I (write) _______________ the conclusion. 40. The earth (circle) _____________ the sun once every 365 days. 41. How many times ____________ you (see) ____________ him since he went to Edinburgh? 42. Look! The boy (cry) _______________ 43. Mary (lose) ________________ her hat for 2 days. 44. He (not finish) _______________ doing it yet. 45. She (not see) ________________ him since Christmas.

1:Does your father cycle to work? =>.................................... 2:How heavy are you? =>.....................

Tìm $x$. $\left|\dfrac{\dfrac{3}{8}+\dfrac{1}{9}-\dfrac{3}{17}}{\dfrac{9}{8}+\dfrac{1}{3}-\dfrac{9}{17}}+x\right|+\dfrac{2}{3}=\dfrac{7}{9}$.

“the tribes of Yellow Emperor rose to power on the plains of Guanzhong and merged with Yan Emperor's tribes following the battle of Banquan” nghĩa là gì? (Ko tra bằng Google Dịch và không tra bất cứ nào liên quan đến Google Dịch nha)

giúp mik bài này 5 s cảm ơn ctlhn đầy đủ

Bài 1: Đánh dấu (✔) trước những câu ở dạng bị động My mother bought me this dress yesterday This letter was written by my secretary. He had a serious accident yesterday. I was allowed to go picnic with friends I didn’t expect Jim to come. I was born in Russia. I bought this book in the local bookstore yesterday. All the wine was drunk by Peter last night. The songs were sung by many famous singers. This cup is made from clay. The vase broke into pieces. My father and my mother are employed by the same company. My parents took me and my sister to the theater. This actor is admired by many people. Jim wasn’t expected to fail the test. Bai 2: Chia động từ trong ngoặc 1. This cake is ______ by Jane. ( make) 2. My phone was _____ by my mother. ( buy) 3. The ring isn’t _____ of diamond . ( make) 4. The milk was ____ by one of my cats ( drink) 5. Your car was ____ next to hers . ( park) 6. This hole was ____ by a mouse. ( dig) 7. Tim is ____ to school by his father. ( take) 8. They are ____ to the prom. ( invite) 9. He is ____ as am assistant. ( engage) 10. The chores are always ____ by my mother. (do) 11. All the exam paper are ____ by my teacher. ( mark) 12. I wasn’t ___ to be the winner. ( expect) 13. The cat is ____ by jane everyday. ( feed) 14. My little is ____ by my grandmother. ( look after) 15. This car isn’t ___ by me . ( drive) Bai 3: Gạch chân lỗi sai trong các câu bị động dưới đây và viết lại câu đúng 1. My keys were find in the living room. __________________________________________________________________ 2. Household rubbish is took to a large dump. __________________________________________________________________ 3. The local library located near the local school. __________________________________________________________________ 4. The chair was fixed with Jim. __________________________________________________________________ 5. This fridge was bought in 2000 by my brothers. __________________________________________________________________ 6. The birthday cake was cutted into 8 pieces. __________________________________________________________________ 7. The organization were founded in 1970. __________________________________________________________________ 8. The streets are litter with rubbish. __________________________________________________________________ 9. The old man helped by his grandchildren. __________________________________________________________________ 10. Many houses were destroyed in the flood. __________________________________________________________________ Bai 4: Đánh dấu (✔) trước những câu bị động có phần tân ngữ ( đứng sau “by”) cần thiết trong câu. Đánh dấu (X) trước câu có phần tân ngữ ( đứng sau “by”) không cần thiết và gạch bỏ chúng X 0. the festival is held by people annually. 1. The dinner was prepared by a famous cook. 2. My money was stolen by someone. 3. I wasn’t told about her story by anyone. 4. Jim’s homework wasn’t finished by him yesterday. 5. This table is made from wood by people. 6. These flowers are grown by a skillful gardener 7. My sister is looked after by a babysister. 8. This letter was sent to me by someone. 9. These walls are painted in pink by my sister. 10. It is thought by people that jane will marry Jim

bài này là chứng minh, giúp mik nha

A nêu tác dụng của dòng điện B dòng điện chạy trong giây dẫn làm cho dây nóng lên đây là tác dụng gì của dòng điện có ích hay có hại

BÀI 5: Chuyển những câu bị động dưới đây về thể khẳng định (+), phủ định (-) và nghi vấn (?) ở thì hiện tại đơn. 1. (+) This table is made of wood. (-)__________________________________________. (?)__________________________________________? 2. (+)__________________________________________. (-) This book isn’t sold in many bookstores. (?)__________________________________________? 3. This gift is wrapped in colorful paper. (-)__________________________________________. (?)__________________________________________? 4. (+)__________________________________________. (-)__________________________________________. Are tickets sold at the entrance? 5. (+)__________________________________________. (-) The car isn’t polished regularly. (?)__________________________________________? 6. The grass is cut every week. (-)__________________________________________. (?)__________________________________________? 7. These tomatoes are grown in Mrs. Smith’s garden. (-)__________________________________________. (?)__________________________________________? 8. . (+)__________________________________________. (-)__________________________________________. Is the bank always closed at 4:30? Bài 6: Khoanh tròn vào đáp án đúng. 1. English is ( speak/ spoken) in many countries. 2. I (am not/ don’t) allowed to stay out too late. 3. These flowers are (watered/ waters) everyday by my mother. 4. The housework (are/ is) done by both of my parents. 5. The food ( is preparing/ is prepared) by Jane. 6. My mother ( is bought/ buys) me new clothese every month. 7. Mr Vu is (admiring/ admired) by many people. 8. May difficult exercises ( are done/ are doing) easily by Jim. 9. The air ( is polluted/ is polluting) by smoke from factories. 10. My glasses are ( broke/ broken). 11. These trees ( are planted/ are plants) by local people. 12. This report ( is typed/ typed) by my assistant. 13. English ( is studying/ is studied) by students at schools. 14. Cheese ( is made/ makes) from milk. 15. Breakfast is prepared ( by/ from) my mother everyday. Bai 7: Chia động từ trong ngoặc về thể bị động thì hiện tại đơn để hoàn thành đoạn văn sau: How sugar is made Sugar (1. normally make) _______________ from sugar cane. This kind of plant (2. grow) _______________ in tropical or subtropical areas. In such developed countries as the United States, harvesting of cane (3. do) _______________ mainly by machine. In other areas, this process (4. also do) _______________ by hand. After the cane (5. harvest) _______________ , it (6. load) _______________ mechanically into trucks or railroad and (7. take) _______________ to mills. Then it (8. process) _______________ into raw sugar. The cane (9. clean) _______________ by warm water before it (10. break) _______________ by two or three crusher rollers. A large part of the juice (11. extract) _______________ and then (12. purify) _______________ to make sugar crystals. In the next steps, sugar crystals (13. tumble) _______________ through heated air. After they (14. dry) _______________ ' they (15. sort) _______________ by size and (16. place) _______________ in storage bins. Sugar (17. pack) _______________ in the packages like we see in the supermarket . Sugar (18. use) _______________ for various purposes and it is a must-have. item in every kitchen. Bài 8: Dựa vào những từ cho sẵn, viết câu bị động ở thì hiện tại đơn. 1. My house/ make from/ wood . _________________________________________________________________ 2. These eggs/ not lay/ by my hens. _________________________________________________________________ 3. Morning exercises/ do/ Jim/ everyday. __________________________________________________________________ 4. The dogs/ feed/ jane/ every day. _________________________________________________________________ 5. Letters/ deliver/ mailman/ everyday. _________________________________________________________________ 6. Vegetables/ grow/ in the fields/ farmers. ________________________________________________________________ 7. Cattle / raise/ farm workers. _________________________________________________________________ 8. Many diseases/ cure/ by surgery/ nowadays. __________________________________________________________________ 9. National heritages/ preserve/ the government. __________________________________________________________________ 10. The architectural features of the house/ carefully study/ architects.

Tìm điều kiện của `a,b,n ∈ Q` để: `N = (x+a)(x+b)(x+a+n)(x+b+n)+k` 1) Phân tích được thành nhân tử. 2) Trở thành bình phương đúng.