41. This led _______ the invention of the telephone. ( about, at, to, in) 42. Alexander Graham Bell was born _______ March 3, 1847 ( at, on, in, since) 43. He worked with deaf-mutes _______ Boston University. ( at , in , with , on) 44. He'll come _______ to pick you_______ ( on/ in , over/ on , in/ up , over/ up ) 45. Mrs. Lien said you could reach her _______ 8 603 423. ( at, on, in, for) 46. English is spoken all ________ the world. (in, on, about , over) 47. The lighting fixture is ________ the dinner table . ( on, above, under, beneath) 48. He had to stay home ______ he was ill. ( because - so - and – until ) IV. Rewrite:

Vote 5* và ctlhn !!!!!!!!!!!!!!!!!!!!!!!!!

31. My mother often spends her free time ____volunteer work at a local orphanage. (to do /work/doing/to work) 32. It’s easy to find my school . It’s _____ the Central Bank. (opposite, under, next, beneath) 33. They put the _____ on the floor, between the armchair and the couch. ( picture , shelf, cushion, rug) 34. Tuan is only seven, but he can eat two _______of rice every meal. (sinks, steamers, saucepans, bowls) 35. You use a ________to cook rice. (sauce pan, rice cooker, frying pan , steamer) 36. You can find the ___________on the couch. ((cushion, bookshelf, sink, TV) 37. There are some______________in the kitchen. 9(bookshelves, cupboards, couches, armchairs) 38. Young children don’t understand that some_________objects are dangerous. (home, house, household, homework) 39. Let’s paint the house __________ .It will be cheaper.(herself – himself – ourselves – themselves) 40. He finally came up ________ the decision to go abroad. (with, for , to, in )

Giúp em với mọi người, dài quá thì giải mình câu 4 thôi cũng được. Em hứa vote 5 sao

21. We just bought two new rackets . We ____________ tennis tomorrow afternoon. ( went to play, played, are going to play, will play ) 22. I am going ________ the movie at 8 this evening. ( see , seeing, to seeing, to see) 23. Would you like _______ a message ? (to leave , leave , leaving , left ) 24. Let’s ________ inside the center, at the cafe’ corner. ( met, meet, to meet, meeting) 25. Tom works in this big city but actually he _____ in a small country village. (born, was born, is born, has been born) 26. The post office is not far _______ my house. ( at, on, in, from ) 27. I’d like to speak _________ the manager, please. ( to, for , with, from ) 28. Hoa loves children. She ________ a teacher when she is old enough. ( is, is going to be, was, was going) 29. Tuan is going to invite twenty of his friends to his birthday party ____________________. ( next week, last week, yesterday , last month) 30. My cousin Hoa is going to visit me . She’ll be here _____Christmas. (in/ at / to /with)

cho biểu thức (1/căn x+1)+(x/căn x-x)..b) tính giá trịbiểu thức p khi x=1/căn 2

11. I’m going to be home late tonight, so you’ll have to cook dinner __________.( your , yours, yourself, you ) 12. Do you have _________ on Sunday ? ( study, studied, studying, to study) 13. Don’t worry about Tim and me. We can look after _____( yourself - myself - himself –ourselves ) 14. Hoa and I _____ saw that accident yesterday . ( myself - herself - ourselves – themselves) 15. Mary and Jack enjoyed __ very much at the party. herself- himself – themselves – ourselves) 16. She cut ________ with the knife. ( himself, herself, itself, myself) 17. On the right _________ of the room, there is a window. ( side, corner, opposite, vase) 18. After school she helps her mother __________ the floor. ( wash, sweep, make, feed) 19. The lighting fixture is ________ the dinner table . ( on, above, under, beneath) 20. You use a ________ to cook rice. (steamer - rice cooker - saucepan - frying pan )

Giúp em dí chủ nhật là phải nộp r mong mng làm r e sẽ kham khảo ạ

1. You must put all dangerous objects out of children’s _________(hands, reach, place, hold) 2. It’s not ________to leave the medicine around the house. (interesting, hard, safe, dangerous) 3. You must ________electrical sockets so that children don’t try to put anything into them. (cover, keep, place, hide) 4. Children often eat chemicals because they look like _____(coca cola, things, candy, cupboard) 5. You have to make ___children do not play with matches. (ensure, surely, sure, ensuring) 6. Each year, ___________destroys homes and injuries children. (fire, match, kitchen, soft drink) 7. I have to go to meet grandma because she is not _________(good, finely, sick, well) 8. Can you come to the movies:- No, I have to _________my chores. (make, think, do, practice) 9. The ______can’t fix the washing machine until tomorrow. (postman, walk man, repairman, chairman) 10. Who repaired your bicycle for you ?- Nobody. I repaired it _____( himself - herself – myself - ourselves)

Tam giác ABC vuông tại A, biết: a, b=10cm, góc C =30° b, b=28cm,C=21cm