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aivanhh
2 năm trước
Để điều chế một lượng cuso4 trong phòng thí nghiệm ng ta sử dụng cu và cu(oh)2 tác dụng với h2so4 hãy cho biết để thu cùng một lượng cuso4 thì trường hợp nào ít tốn axit hơn?
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Bài 2: Đọc kĩ đoạn trích sau và thực hiện các yêu cầu: “Vì tôi biết rõ, nhắc đến mẹ tôi, cô tôi chỉ có ý gieo rắc vào đầu óc tôi những hoài nghi để tôi khinh miệt và ruồng rẫy mẹ tôi, một người đàn bà đã bị cái tội là góa chồng, nợ nần cùng túng quá, phải bỏ con cái đi tha hương cầu thực. Nhưng đời nào tình thương yêu và lòng kính mến mẹ tôi lại bị những rắp tâm tanh bẩn xâm phạm đến…Mặc dầu non một năm ròng mẹ tôi không gửi cho tôi lấy một lá thư, nhắn người thăm tôi lấy một lời và gửi cho tôi lấy một đồng quà.” 1. Xác định t phép liên kết được sử dụng trong đoạn trích trên và chỉ rõ từ ngữ dùng làm phương tiện liên kết. 2. Nhân vật tôi trong đoạn trích là ai? Nhân vật ấy đang phải sống trong hoàn cảnh như thế nào?

81. I've learned to put all the noise. A. up with B. out C. on 82. That song was popular people from my father's generation. A. for B. on C. about D. with 83. The English language is rich vocabulary A. at B. in C. on D. for 84. She was quick understanding what we wanted her to do. A in B. about C. for D.at 85........ mistake, I took the wrong book from my desk this morning, a. Through b. By c. With d. In 86. They chose him their leader. a. with b. for c.by d. into 87. I want you to arrange these order by putting the largest first then the next, and so or a. on b. out of c. in d. from 88. The telescope will photograph distant galaxies, attempt to understand their past. A. in B. for C. on D. with 89. The issue _question is more complex than we think. A in B. from C. on 90.1 _was only absent the office for a few minutes! A. for C. in D. about 91. The old manager has just retired, so Tom takes his position A. in B. on C. up D. out 92. I've just spent two weeks looking an aunt of mine who's been ill. A. at B. for C. out for D. after 93. Were you aware _the regulations against smoking in the area? A. in B. with C. of D. about 94. My uncle took _golf when he retired from work. A. on B. after C. up D. over 95. The boy was always getting trouble as a youth. Then, to everyone's surprise, he became a policeman. A. into B. onto C. on D. with 96. My grandfather passed when I was only six years old. He had lung cancer. A. out B. over C. away D. off 97. She started the course two months ago but dropped after only a month. A. in B. back C. out D. off 98. We are here to provide you the best service possible. A. of B. with C. to D. for 99. Go and get me a carton cigarettes. a. with b. of c.out of d. no 100. He is negligent his duties a. with b.to c.for d.of

Exercise 1 1. I enjoy_______ alone. a. be b. being c. to be d. to have been 2. Would you like_______ to the party? a. to come b. come c. coming d. to have come 3. Do you mind_______ such a long way to work everyday? a. to travel b. travel c. to have traveled d. traveling 4. I don’t like that house. I would hate_______ there. a. live b. living c. to live d. to have lived 5. Sometimes I'd like_______ to play the piano. a. to learn b. learn c. learning d. to have learned 6. Please remember_______ this letter. a. to post b. post c. posting d. to have posted 7. We tried_______ the fire out but we were unsuccessful. We had to call the fire-brigade. a. putting b. put c. to put d. to have put 8. When you see John, remember_______ it by the window and now it has gone. a. to have given b. giving c. give d. to give 9. Someone must have taken my bad. I clearly remember_______ it by the window and now it has gone. a. leave b. leaving c. to leave d. to have left 10. Jane needed some money. She tried_______ Harry but he couldn't help her. a. to have asked b. ask c. to ask d. asking 11. I think they are now accustomed to _______ 12 hours a day. a. work b. to work c. worked d. working 12. He tried_______ the shelf but he wasn't tall enough. a. reach b. reaching c. to reach d. to have reached 13. Alice didn't expect_______ to Bill's party. a. asking b. being asked c. to ask d. to be asked 14. I finally finished_______ at 7:00 pm and served dinner. a. cooking b. being cooked c. to cook d. to be cooked 15. Sam always remembers_______ in the garage so that the driveway in free for other cars. a. parking b. being parked c. to park d. to be parked 16. The nurse suggested_______ two aspirins. a. taking b. being taken c. to take d. to be taken 17. Would you mind not_______ the radio until I've finished with this phone call? a. turning on b. being turned on c. to turn on d. to be turned on 18. They were fortunate_______ from the fire before the building collapsed. a. rescuing b. to have rescued c. to rescue d. to have been rescued 19. The mouse family avoided_______ by coming out only when the house was empty and the two cats were outside. a. catching b. being caught c. to have been caught d. to be caught Exercise 2 1. It's very kind of you_______ so. a. say b. to say c. saying d. to be saying 2. Please show me how_______ this. a. do b. to do c. doing d. to have done 3. One is never too old_______ a. learning b. learn c. to have learned d. to learn 4. You are old enough_______ out alone. a. going b. go c. to go d. to have gone 5. I'm very glad_______ you. a. to meet b. meet c. meeting d. to be meeting 6. It's nice_______ you. a. to know b. know c. knowing d. to be knowing 7. You have no right_______ my daughter. a. see b. to see c. seeing d. to have seen 8. Please tell me what_______ a. doing b. do c. to do d. to have done 9. I forbid you _______ my letter. a. to read b. read c. to have read d. reading 10. We stopped_______ hello to her. a. say b. saying b. to have said d. to say 11. We came_______ help her. a. help b. to help c. to have helped d. helping 12. I'll invite her_______ my daughter. a. teaching b. teach c. to teach d. to have taught 13. I don’t feel like_______ to the cinema now. a. go b. going c. to go d. to have gone 14. It's no good_______ video games. a. play b. to have played c. to play d. playing 15. It's no use_______ with him. a. working b. work c. to work d. to have worked 16. The idea of_______ abroad appeals to me. a. working b. work c. to work d. being working 17. The Rogers are happy about_______ a baby. a. have b. having c. to have d. to be having 18. Camping is hard if you're not used to _______ on the ground. a. be slept b. to be sleeping c. sleeping d. sleeping 19. Mrs. Kerry didn’t want_______ on a. to be operated b. being operated c. to operate d. to be operating 20. Windows are used to let in light and _______ out cold. a. to keep b. keep c. keeping d. for keeping

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