Giải phương trình:sin²x(1+sinx)+cos²𝑥(1+cos𝑥)=2cos²𝑥

Find ten mistakes in this passage and correct them. 'We interrupt your usual schedule to bring you an important news. We are receiving informations about a spaceship that has landed outside the White House. The large ship seems to be made of glasses. Reports say that a short time ago aliens came out of the craft. Eye-witnesses described them as short and said their clothes was made of metal and their hairs was bright green. Strangely, one of them appeared to be wearing a jeans. Much people said that they seemed to be friendly. The President of the United States is currently holding a meeting with the visitors in the hope that we can exchange knowledges. Police advice are to stay indoors and under no circumstances approach the spaceship. We will be back with another news as soon as we can. And now, back to your usual programme, Gardening for Beginners'.

31. Lan is ………………. than her sister. A. lazy B. lazily C. lazier D. lazilier 32. He feels ……….. than last year because his study results are ………………… A. happy/ good B. happier/ gooder C. more happy/more good D. happier/better 33. He is …………. at maths than at any other subjects. A. better B. more good C. goodlier D. gooder 34. Phuong can speak English ……….. than Minh. A. more fluent B. fluently C. fluent D. more fluently 35. Cinderrella danced …………… than any other girls at the ball. A.more graceful B. gracefuler C. gracefully D. more gracefully 36. Chemistry is …………….. than physics. A. easy B. easily C. easier D. more easily 37. Rabbits run……………… than tortoises. A. fast B. fastly C. fastlier D. faster 38. She can pronounce English words …………. than she could last term. A. correctlier B . more correct C. more correctly D. correcter 39. The country is ………….. than the city. A. quieter B . more quiet C. more quietly D. quietlier 40. In this class , the students are talking …………… than the teacher. A. loudly B. more loud C. loudlier D. louder. 41. I can learn a subject …………… if I like it and ………… if I don’t like it. A. good/ bad B. better/ worse C. better/ badlier D. gooder/worse 42. She is the most …………….. girl in our class. A. intelligent B. intelligentest C. tall D. tallest 43. That T¬shirt is the …………… we have in stock. A. big B.bigger C. small D. smallest 44. This hat is the ……………… of all. A. expensivest B. more expensive C. cheapest D. cheaper 45. Food becomes ………….. during the time of the flood. A. more scarcer B. most scarce C. scarcest D. scarce 46.Lan is the most ……………. student in my class. A. hard¬work B. hard¬working C. good D. best 47. This book is the ………………… of all A. bored B.boring C. more boring D. most boring 48. She has ……….. books than I do. A least B. fewer C. more few D. fewest 49. He finished the test …………..of all. A. rapidly B. the most rapidly C. most rapidly D. more rapidly 50. Many chemicals react ……………..in acid solutions A . more quick B. more quickly C. quicklier D. as quickly more

Giúp mình với câu hỏi là điền từ thích hợp

II. Read the text below and write one word in each blank to complete it. process energy elevator into warm used well effect reason increase Elevator air conditioning is fast becoming a popular concept around the world. The primary (1)_____________for installing an elevator air conditioner is the comfort that it provides while traveling in the (2)_____________. It stabilizes the condition of the air inside the elevator car. Some elevator air conditioners can be (3)_____________in countries with cold climates if a thermostat is used to reverse the refrigeration cycle to (4) _____________ the elevator car. Heat generated from the cooling (5) _____________ is dissipated into the hoist way. The elevator cab (or car) is ordinarily not air-tight, and some of this heat may reenter the car and reduce the overall cooling (6) _____________. The air from the lobby constantly leaks (7) _____________ the elevator shaft due to elevator movements as (8)_____________ as elevator shaft ventilation requirements. Using this conditioned air in the elevator does not (9) _____________ energy costs. However, by using an independent elevator air-conditioner to achieve better temperature control inside the car, more (10) _____________ will be used.

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V. Read the following text and use the words given in the box to fill in the blanks. transmitting Although principle began receiving his been time The telegraph and telephone are both wire-based electrical systems, and Alexander Graham Bell's success with the telephone came as a direct result of his attempts to (1) _____________ the telegraph. When he (2) _____________ experimenting with electrical signals, the telegraph had (3)_____________ an established means of communication for some 30 years. (4)_____________a highly successful system, the telegraph was basically limited to (5)_____________ and sending one message at a time. Bell's extensive knowledge of the nature of sound and (6) _____________ understanding of music enabled him to conjecture the possibility of (7) _____________multiple messages over the same wire at the same time. Although the idea of a "multiple telegraph" had been in existence for some (8)_____________, no one had been able to fabricate one - until Bell. His "harmonic telegraph" was based on the (9) _____________ that several notes could be sent simultaneously along the same wire if the notes or signals (10) _____________ in pitch.

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T = 1/1x2 + 1/2x3 + 1/3x4 + ... + 1/99x100