Cho 5,4 gam kim loại R nhóm IIIA tác dụng với 180 gam dd H2SO4 loãng 19,6%, sauphanr ứng thu được 6,72 lít H2 (đktc) và dd A. a. Tìm tên kim loại R. b. Tính nồng độ % các chất có trong dd A.

Khai căn theo điều kiện cho trước √(12-y)^2 với y>15

|x| = |x + 1| ..............................

↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ω ω

Cho mình nhận xét về cyoons sách nhungw cuộc phiêu lưu của Shelock holmes nha mn

giúp e phát này với cô giáo e căng quá :)) e cảm ơn nhìu nhé

Vẽ theo hình ạ. Nếu có biến hóa gì thì biến hóa lại đơn giản chút là được ạ sẽ cho ctlhn cho tranh chất lượng cao nhé. PS : mn nhớ ký chữ Trango vào trong bức tranh đó luôn nhé

Exercise 3: Choose the best answer to complete each of the following sentences. 1. By the year 2050, many people currently employed __________ their jobs. A. have lost B. will be losing C. will have lost D. are losing 2. Susan _________ as a nurse for 3 years before her marriage. A. has been working B. has worked C. worked D. is working 3. Since they had that big argument, he crosses the street whenever he _______ her. A. saw B. sees C. will see D. is seeing 4. This time tomorrow I __________ in the swimming pool. A. am relaxing B. relax C. will be relaxing D. relaxed 5. At the end of this month, we _________ here for 10 years. A. will have been living B. are living C. live D. will be living 6. The beach was so crowded the other day that we __________ difficulty finding an empty spot. A. have B. have had C. had D. have been living 7. Robert __________ for the company for very long before he was promoted. A. hasn't been working B. didn't work C. hadn't been working D. wasn't working 8. _____________ ? Your eyes are red. A. Did you cry B. Have you been cried C. Were you crying D. Have you been crying 9. He looked tired because he __________ for 6 hours. A. ran B. was running C. has been running D. had been running 10. In 1875, archeologists __________ the ruins of the Olympic Stadium in Greece. A. discovered B. were discovering C. have discovered D. had discovered Exercise 4: Choose the best answer to complete each of the following sentences. 1. We ________ very hard at the office lately as we are negotiating an important contract. A. are working B. were working C. have been working D. had been working 2. You can't believe a word he says. He _________. A. always lies B. is always lying C. has always lied D. will always lie 3. I often find things on the beach. I __________ this very old bottle yesterday. A. found B. was finding C. has found D. had been finding 4. They ________ the new bridge by the end of the year. A. will complete B. will have completed C. have completed D. had been completing 5. He said he _________ his homework since 7 o'clock. A. did B. has done C. had been done D. had been doing 6. A taxi collided with his car ten minutes ago but the police ________ yet. A. has not come B. have not come C. did not come D. had not come 7. At this moment tomorrow night I ________ on a ship. A. sleep B. shall sleep C. shall be slept D. shall be sleeping 8. Before leaving home in the morning, she _________her mother she ________ in the factory that afternoon. A. had told-would work B. told-would work C. told-works D. had told-worked 9. Before you mentioned him, I __________ of that author. A. never hear B. have never heard C. had never heard D. never heard 10. By the end of this year, Tom __________ English for 3 years. A. will be studying B. has studied C. will have studied D. has been studying

Exercise 1: Choose the best answer to complete each of the following sentences. 1. She came into the room while they ________ television A. watched B. have watched C. are watching D. were watching 2. I _________ a headache since yesterday. A. had B. was having C. have had D. would have 3. The teacher _________ into the room. A. has still come B. has already come C. has yet come D. has recently come 4. When he failed to meet us, we __________ without him. A. left B. would leave C. was leaving D. has left 5. He ___________ book the tickets, but he had no time to call at the cinema. A. would B. will C. is going to D. was going to 6. Peter has been trying for an hour, but his car still ___________ start. A. won't B. wouldn't C. didn't D. hasn't 7. It's an hour since he _________, so he must be at the office now. A. is leaving B. was leaving C. has left D. left 8. Most students _______ hard for the last few weeks. A. were working B. worked C. are working D. have been working 9. He ________ up his mind yet. A. didn't make B. hasn't made C. wasn't made D. wasn't making 10. The baby ________ non-stop for the last two hours. A. cried B. was crying C. is crying D. has been crying Exercise 2: Choose the best answer to complete each of the following sentences. 1. The girl weeps whenever she ________ such a story. A. hears B. has heard C. will hear D. heard 2. As soon as we ________ this new apartment, we ________. A. are finding-will move B. found-moved C. would find-move D. find-would move 3. My teacher arrived after we ________ for him for ten minutes. A. was waiting B. have waited C. had waited D. waited 4. This is the first time I _______ to play badminton. A. have tried B. am trying C. was trying D. would be trying 5. She _______here but she doesn't work here now. A. has worked B. had work C. used to work D. used to working 6. Jack went out, but he ________ anyone where he was going. A. doesn't tell B. not told C. wasn't telling D. didn't tell 7. London _________ the capital of the United Kingdom. A. is B. was C. will be D. is being 8. Someone _________ at the door. Can you hear it? A. knocks B. is knocking C. will knock D. was knocking 9. What are you cooking in that saucepan? It ________ good. A. smells B. is smelling C. smelled D. has smelled 10. I used to swim in this river when I _______ young A. am B. was C. will be D. have been giúp mk vs dc ko mk đang cần gấp lắm

I wish I (be) a fashion designer.