Cho hpt 14x2-21y2-6x+45y-14=0 35x2+28y2+41x-122y+56=0

31. There is no ______ for them to do that. A. need B. needs C. needless D. needing 32. The _____ development leads to our country’s prosperity. A. industry B. industries C. industrial D. industrialize 33. Farmers ______ their land to make it _______. A. fertilize / product B. fertilizer / productive C. fertilize / production D. fertilize /productive 34. Many communities are burning garbage and other biological waste products to produce ______. A. electric B. electricity C. electrician D. electrify 35. _______wildlife needs the cooperation of the public. A. safe B. safety C. safeguard D. safeguarding 36. Stress and tiredness often lead to lack of _______. A. concentrate B. concentration C. concentrated D. concentrator 37. Human being are the worst _______ on the earth. A. pollutes B. polluters C. pollutants D. pollutions 38. A combine harvest is very ______, it can cut and thresh rice at the same time. A. use B. useless C. useful D. usefulness 39. Mrs. Christine has been told by her doctor that she is _________, she cannot have a child of her own. A. childless B. childhood C. childish D. child 40. Are you _____ of the danger that you are facing? A. sense B. sensible C. senseless D. sensation 41. Thanks to my friends’ ________ remarks, my essay has been improved. A. construct B. construction C. constructive D. constructor 42. What is your _____ in life? A. aim B. aimless C. aimlessly D. aimlessness 43. The matter is under ______. A. investigate B. investigation C. investigatory D. investigative 44. The president traveled under the ______ of many soldiers. A. protect B. protective C. protection D. protector 45. The US made a _____ declaration of war to Iraq. A. formal B. formality C. formalize D. formalism

Để đánh số trang sách có 2021 trang cần dùng bao nhiêu chữ số. CÓ GIẢI THÍCH

E hỏi bài 2 ai mng giúp e với ạ

Giúp mik vs ạ nhanh cần gấp hứa cho ctlhn

MNG LÀM NHỚ GIẢI THÍCH CHỨ EM RP CÂU TRẢ LỜI VÌ SAO CHÉP ĐÓ NHA :))) 1.do you think that the various crafts remind people______ a specific region? A. about. B. of. C.for. D. at 2._____this hand-embroidered picture was epensive, we bought it. A. As. B. Because. C. Even though. D. so that

Giúp mik đi các bạn. Làm nhanh nha. Cảm ơn rất nhiều ạ

31. Nick does leisure activities in his free time which makes he feels ……….. A. clever B. stress C. boring D. relaxing 32. You should avoid ………………… too much TV . It’s not good for your eyes A. seeing B. looking C. watching D. glancing 33. Nga likes ……….. with her close friends on Saturday evenings . She feels relaxing A. window shop B. window to shop C. window shops D. window shopping 34. Do you fancy ……………… around the West Lake with me this Sunday morning ? A. going B. having C. staying D. moving 35. Why don’t we ……………. our parents with some DIY projects ? I think it’s useful A. help B. do C. make D. give 36. My dog eats so much food ! I ……… him three times a day A. take B. feed C. collect D. look up 37. The doorbell rang ……………. Tim entered his flat A. so B. as soon as C. when D. until 38. I ……………… mountain biking with my friend last week A. go B. went C. played D. did 39. Do you want to ………… yoga after work every Friday ? A. play B. open C. go D. do 40. Would you like …………… out with me tonight ? A. to hang B. hanging C. hung D. hang 41. She is …………… in playing football A. fond B. interested C. keen D. enjoy

Dung dịch A có hoà tan 18 gam NaHSO4 và 13,375 gam NH4Cl. Dung dịch B chứa ion Ba2+, 0,2mol NO3−, 0,35mol K+, 0,35mol OH-. Trộn dung dịch A với dung dịch B thu được m gam kết tủa và V lít khí ởđktc. Tính m và V?

vẽ mầm thắc mắc nl: bài linh vật khoảng bao lâu là đc duyệt ạ? (bác nèo biết thì trl nhoá)