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cho các chất sau FeSO4,H2SO4,Cu(OH)2,MgO trong các chất trên chất nào tác dụng được vs ddHCl ddSO4 ddBacl2 viết phương trình minh họa
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21. Each time you turn it on, with appropriate hardware and software, it is capable of doing almost anything you ask. A. unsuitable B. Suitable C. ill-prepared D. irregular 22.An international medical conference initiated by Davison resulted in the birth of the League of Red Cross Societies in 1991. A. started B. helped C. treated D. dedicated 23. The alarm-clock suddenly __________ in the middle of the night. A. went out B. went on C. went by D. went off 24. Only the _____________ can hold the ball with both hands. A. referee B. player C. audience D. goalie 25. Man :“I’d like the blue jacket, can I try it on ? Shopkeeper:: “Yes,________________” A. you must B. certainly C. you would D. you do 26. Tom resembles his grandfather. A. takes after B. takes care C. takes place D. takes off 27. All planes_____ before departure. A. will check B. will have checked C. will be checked D. will be checking 28.The larger the apartment, the __________________ the rent is. A. expensive B. more expensive C. expensively D. most expensive 29.____________the phone rang later that night did Tom remember the appointment. A. No sooner B. Only C. Not until D. Just before 30. Visitors to the local museum are mostly attracted by ______ rocking chair. A. a wooden old beautiful European. B. a beautiful old European wooden. C. an old beautiful wooden European. D. an old wooden European beautiful. 31. There is __________ table in my bed room . A. a new round wooden B. a round wooden new C. a round new wooden D. a new wooden round 32. Marie Curie was the first and only woman ____ two Nobel Prizes. A. who win B. that wins C. to have won D. to be won 33._____________ strong, family members have to be engaged in each other's lives. A. Stayed B. Staying C. To stay D. Be stayed 34. There is also a huge range of videos, which can reinforce and extend the _______ a child finds in a book A. pleasure B. pleased C. pleasing D. pleasant 35.Today many species of plants and animals are in _________of extinction. A. danger B. endangered C. endanger D. dangerous 36. I must congratulate you ______ your excellent exam results. A. in B. on C. for D. about 37. You ______ clean the windows. The window-cleaner is coming tomorrow. A. don’t have B. must C. mustn’t D. needn’t 38. Neither of the boys came to school yesterday, __________? A. didn’t he B. does he C. did he D. doesn’t he 39.Too many television programmes induce an incurious, uncritical attitude that is going to make learning ___ more difficult. A. most B. much C. more D. least 40. My car ________ on the way to work. I had to call a tow truck. A. broke down B. broke out C. got over D. turned off 41.Laura said she had worked on the assignment since _______. A. yesterday B. two days ago C. the day before D. the next day 42.John asked me _______ interested in any kind of sports. A. if I were B. if were I C. if was I D. if I was 43. If you had stayed at home, there _______ any trouble. A. would not be B. will not be C. is not D. would not have been 44. The children, ______ parents work late, are taken home by bus. A. that B. whom C. whose D. their 45. The novel has had a tremendous impact on ________ and publishing markets. A. entertain B. entertainer C. entertainment D. entertainingly 46.Hoa doesn’t play the guitar as well as Minh. A. Minh plays the guitar as well. B. Hoa doesn’t play the guitar well. C. Hoa doesn’t play the guitar better than Minh D. Minh plays the guitar better than Hoa. 47.My list of things gets ……………I don’t know when to finish them all. A. less and less B. shorter and shorter C. longer and longer D. more and more difficulty 48. We got lost because we forgot to take a map with us. A. Unless we had forgotten to take the map with us, we would have got lost. B. If we had remembered to take a map with us, we wouldn't have got lost. C. Had we not forgotten to take the map with us, we would have got lost. D. If we had remembered to take a map with us, we would have got lost. 49. We cut down many forests. The Earth becomes hot. A. The more forests we cut down, the hotter the Earth becomes. B. The more we cut down forests, the hotter the Earth becomes, C. The more forests we cut down, the Earth becomes hotter. D. The more we cut down forests, the Earth becomes hotter 50. John applied for the job. However, he has no experience in the field. A. John didn't apply for the job if he had experience in the field. B. Because of his experience in the field, John applied for the job. C. John was unable to apply for the job because he was inexperienced in the field. D. In spite of his inexperience in the field, John applied for th

1. Presents______ in colored paper and put under the Christmas tree. A. are wrapped B. are wrap C. are wraped D. are wrapping 2. Tom likes_____. He spends lots of hours watching the birds. A. bird-watching B. bird-watch C. watch-bird D. watching-bird 3. Greg______ me that he liked rock music. A. said to B. told to C. asked D. explained 4. Sally is quite keen _____the idea. A. in B.on C. of D. for 5. They recently returned_____ Paris from London. A. to B. for C. towards D. from 6. I thanked my classmate _____ helping me with my homework. A. for B. about C. of D. from 7. She_____ me she didn’t know what to do. A. said B. told C. asked D. suggested 8. Anita is fond_____ playing the piano. A. in B.on C.of D. for 9. The fire is made______ matches or lighters. It is made in the traditional way. A. with B. without C. of D. by 10. Ten countries participated in the discussions. A. took part in B. held C. went to D. arranged 11. I______ that I didn’t know what to do. A. said B. told C. asked D. suggested 12. James likes climbing mountain. He has just joined a _______ club. A. climb-mountain B. climbing-mountain C. mountain-climbing D. mountain-climb 13. It is a custom to give presents at Christmas. A. tradition B. habit C. hobby D. rule 14. It’s cold. Don’t go out_______your coat. A. with B. without C. in D. wearing 15. Bob had someone _______ his house. A. paint B. paints C. painted D. painting 16. These computers are made_______Australia. A. in B. from C. of D. by 17. The teacher told us ______ talk. A. not to B. not C. don’t D. to not 18. We used to go and fetch milk _________ the farm. A. from B. at C. to D. in 19. James told me why he went home early two days _____. A. before B. ago C. following D. previous 20. The journey from the airport to the university ________ about an hour and a half. A. spends B. takes C. want D. passes

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