C. 3.Vì nó do 3 nguyên tố Ca, S, O tạo nên. Vì vậy ta chọn câu C. 3
Xin hay nhất cho nhóm.
Đáp án:`C.3`
Giải thích các bước giải:
`- CaSO_3` có 3 nguyên tố là `S, Ca` và `O`
76. Water ____ at 100 degrees Celsius. A. boilsB. boiledC. is boilingD. will boil 77.How long ____ you ____ her? – For five months. A. do/knowB. are/knowingC. have/knownD. had/known 78. I usually ____ to school by bus. A. wentB. am goingC. goD. have gone 79.I ____ a lot of badminton recently. A. playB. have playedC. am playingD. was playing 80. He ____ up at five every morning. A. is gettingB. gotC. getsD. was getting 81. ____ she ____ in Hue at the moment? A. Does/liveB. Is/livingC. Did/liveD. Was/living 82.He usually ____ her at weekend but now he ____ in bed because of his severe illness. A. visits/stays B. visits/stayingC. visited/staysD. visits/is staying 83.My brother................out at weekend. A. doesn’t usually goB. does usually not go C. doesn’t usually goesD. usually doesn’t goes. 84.Everyday, my sister .................the floor. A. usually cleanB. cleans usuallyC. usually cleanedD. usually cleans 85.Anita ........ very hard at the moment. A. is studyingB. studiesC. studiedD. has studied 86.Since I left Venezuela six years ago, I _______to visit friends and family several times A. return B. will have returned C. am returning D. have returned 87.I’m busy at the moment _______on the computer A. I work B. I’m worked C. I’m working D. I worked 88.I ______go as soon as you comeback. A.went B. will go C. have gone D. am going 89. Do you think they .............. (win) the championship? A. are going to winB. will winC. win D. won 90. We are so excited about our trip next month to France. We (visit) .............. Paris, Nice and Grenoble. A. are going to visit B. will visitC.visit D. visite
56. Since _______, I have heard nothing from him. A. he had leftB. he leftC. he has leftD. he was left 57. He will take the dog out for a walk as soon as he ______ dinner. A. finishB. finishesC. will finishD. finishing 58. I will be glad if he _______ with us. A. had goneB. did goC. WentD. goes 59.A: The alarm’s going. It’s making an awful noise. B: Ok, I ……………it off A. am switching B. will switch C. am going to switch D. switch 60. Tom and Mary ______ for Vietnam tomorrow. A. leaveB. are leavingC. LeavingD. are left 61. He always ________ for a walk in the evening. A. goB. is goingC. goesD. going 62. Her brother ______ in Canada at present. A. workingB. WorksC. is workingD. work 63.A: You have left the light go on B: Oh, I have. I _________and turn it on. A. will go B. have gone C. go D. am going 64.It didn’t rain in the spring. I think we _____water next summer. A. run out of B. will run out of C. are going to run out of D. have run out of 65. How many times ____ you ____ this film? – The first time. A. have/ seenB. did/see C. do/see D. had/seen 66. He ____ up at five every morning. A. is gettingB. gotC. getsD. was getting 67. ____ she ____ in Hue at the moment? A. Does/liveB. Is/livingC. Did/liveD. Was/living 68. He usually __ her at weekend but now he __ in bed because of his severe illness. A. visits/stays B. visits/stayingC. visited/staysD. visits/is staying 69.Don’t make noise, children! Parents ____. A. sleepB. are sleepingC. were sleeping D. slept 70. He ____ to New York three times this year. A. had beenB. wasC. has beenD. is 71. He ____ in the same house since 1975. A. has livedB. is livingC. livedD. had lived 72. We ____ him since he ____ married. A. didn’t see/gotB. haven’t seen/gotC. don’t/getD. hadn’t seen/got 73 A: Why did you buy all this sugar and chocolate. B: I _________a delicious dessert for dinner tonight. A.make B.will make C. am going to make D. will have make 74. We ____ what to do with the money yet. A. not decideB. didn’t decideC. haven’t decided D. hadn’t decided 75.Please don’t make so much noise. I ____. A. studyingB. studyC. am studyingD. studied
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làm dùm đi bạn ơi iiiiiiiiiiii
Bạn ơi giúp mik bài này với 8h 5 mik phải nộp rồi bạn nào làm nhanh mik cho 5 sao nha
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36. Mary __________ a beautiful long dress at the moment. A. is wearing B. wears C. was wearing D. has worn 37. He ___________in Vietnam since January 5. A. has been B. had been C. was D. have been 38. Up to now, I __________ a lot of information about her. A. would learn B. have learnt C. have learn D. will learn 39. The canteen always __________ at 7:10 a.m. A. will open B. will have opened C. opens D. be opened 40. I usually _________ jeans, but today I ___________ a suit. A. wear / was wearing B. am wearing / wear C.wear / wear D. wear / am wearing 41. “When did you come home?” “I ___________ here since last Sunday.” A. had been B. was C. have D. have been 42. As soon as he __________ a certificate in English, he will apply for a job. A. would get B. got C. gets D. will get 43. He usually ____________in green ink. A. write B. writes C. wrote D. has written 44. Maria ___________ here since last week. A. has been B. was C. were D. have been 45. My sister __________ in Paris at the moment. A. will study B. studies C. is studying D. has studied 46. When water freezes, it ____________ into ice. A. turns B. has turned C. would turn D. is turning 47. At the moment, Ann ________ a letter to her parents. A. is writing B. writes C. was writing D. has written 48. Since 1980, scientists all over the world … a lot of things to fight against AIDS. A. have done B. are going C. did D. had done 49. At present, they ____________ at their office. A. have worked B. are going to work C. are working` D. were working 50. Whenever my little sister _________, all of us will run to him. A. cries B. will cry C.. would cry D. cried 51. We _______ Dorothy since last Saturday. A. don’t seeB. haven’t seenC. didn’t seeD. hadn’t seen 52. I ______ Texas State University now. A. am attendingB. AttendC. was attendingD. attended 53.. He has been selling motorbikes ________. A. ten years agoB. since ten yearsC. for ten years agoD. for ten years 54. They ______ table tennis when their father comes back home. A. will playB. will be playingC. PlayD. would play 55.A: Your dad has made a terrible mess in the kitchen B: Don’t worry, mum. I _________up immediately. A. will clear B. clear C. am clearing D. am going to clear
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