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tricua1801
2 năm trước
Hoàn thành các PTHH sau: Fe 2 O 3 + H 2 → Fe x O y + X 1 X 2 + X 3 → Na 2 SO 4 + BaSO 4 + CO 2 + H 2 O X 2 + X 4 → Na 2 SO 4 + BaSO 4 + CO 2 + H 2 O X 5 + X 6 → Fe 2 (SO 4 ) 3 + SO 2 + H 2 O X 3 + X 7 → BaCO 3 + H 2 O X 3 + X 8 → BaCO 3 + CaCO 3 + H 2 O
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Các câu hỏi liên quan

I. Supply the verbs in past progressive tense. 1. At this time last year, I ___________________an English course (attend) 2. Jim ________________ under the tree when he heard an explosion (stand) 3. The boy fell and hurt himself while he _________________ a bicycle (ride) 4. When we met them last year, they______________ in Santiago (live) 5. The tourist lost his camera while he________________ around the city (walk) 6. The lorry _______________ very fast when it hit our car (go) 7. While I ____________________in my room, my roommate ___________________ a party in the other room (study/have) 8. Mary and I___________________ the house when the telephone rang (just leave) 9. We __________________ in the café when they saw us (sit) 10. I ___________________down the street when it began to rain (go) II. Supply the verbs in simple past or past progressive tense. 1. I ________________ (call) Mr Wilson at 9 last night, but he (not be)_________________at home. He (study) _______________ at the library 2. I _________________ (not hear) the thunder during the storm last night because I ________________ (sleep) 3. It was beautiful yesterday when we went for a walk in the park. The sun______________(shine). The birds_____________(sing) 4. My brother and sister ________________ (talk) about something when I ________________ (walk) into the room. 5. Tom went to his friends ‘house, but the boys ___________________ (not be) there. They (play)_____________soccer in the vacant lot down the street. 6. The little boy _______________ (fall) asleep while his mother___________________ (read) him a story. 7. I really enjoyed my holiday last January. While it_______________(snow) in Iowa, the sun ______________ (shine) in Florida. 8. While Ted _______________ (shovel) snow from his driveway yesterday, his wife _________________ (bring) him a cup of hot chocolate. 9. John _________________ (have) a car accident last week. He __________________ (drive) down the street when suddenly a lorry __________________ (hit) his car from behind. 10. Ten years ago, the government _______________ (decide) to begin a food programme. At that time, many people in the rural areas _______________ (starve) due to several years of drought. 11. They ___________________(wait) for me when I _________________ at the station (arrive) 12. She ________________ (swim) in the sea when I ___________________ her (see) 13. ___________________they__________________(play) tennis when it _________________ raining (start)? 14. We _____________ (drive) home from the theatre when the police _______________(stop) us. 15. The wind __________________ (blow) very hard when I ________________(go) out this morning. 16. When she __________________ (leave) him, he _____________________ (become) quite ill. 17. I _______________(be) looking for some photos when you rang but I ______________(not find) them.

ĐÔI TAI CỦA TÂM HỒN Một cô gái vừa gầy vừa thấp bị thầy giáo loại ra khỏi dàn đồng ca. Cũng chỉ tại cô bé ấy lúc nào cũng chỉ mặc mỗi một bộ quần áo vừa bẩn vừa cũ, lại rộng nữa. Cô bé buồn tủi khóc một mình trong công viên. Cô bé nghĩ: “Tại sao mình lại không được hát? Chẳng lẽ mình hát tồi đến thế sao? ”. Cô bé nghĩ mãi rồi cô cất giọng hát khe khẽ. Cô bé cứ hát hết bài này đến bài khác cho đến khi mệt lả mới thôi. “Cháu hát hay quá !”. Một giọng nói vang lên: “Cảm ơn cháu, cháu gái bé nhỏ, cháu đã cho ta cả một buổi chiều thật vui vẻ”. Cô bé ngẩn người.Người vừa khen cô bé là một ông cụ tóc bạc trắng. Ông cụ nói xong liền đứng dậy và chậm rãi bước đi. Cứ như vậy nhiều năm trôi qua, cô bé giờ đây đã trở thành một ca sĩ nổi tiếng. Cô gái vẫn không quên cụ già ngồi tựa lưng vào thành ghế đá trong công viên nghe cô hát. Một buổi chiều mùa đông, cô đến công viên tìm cụ già nhưng ở đó chỉ còn lại chiếc ghế đá trống không. “Cụ già đó qua đời rồi. Cụ ấy điếc đã hơn 20 năm nay” - Một người trong công viên nói với cô. Cô gái sững người. Một cụ già ngày ngày vẫn chăm chú lắng nghe và khen cô hát hay lại là một người không có khả năng nghe? Hoàng Phương 1. Nguyên nhân nào khiến cô bé trở thành ca sĩ? 2.Câu 2. Cuối cùng, trong công viên, cô bé đã làm gì? A. Suy nghĩ và khóc một mình. B. Gặp gỡ và trò chuyện với một cụ già. C. Cất giọng hát khe khẽ hết bài này đến bài khác cho đến khi mệt lả. D. Một mình ngồi khóc xong rồi tiếp tục chơi.

Past simple + Present simple + Present continuous Exercise 1: Choose the correct answer 1. Do you know Janelyn? Yes, of course, I (met/ meet/ is meeting) her every day! 2. I ( am / was / were ) very happy on my last vacation. 3. Where is Tom?Ah he ( is playing/ plays/played) football with his friends in the garden 5. He ( doesn’t / won’t / didn’t ) come here last night. 6. (When / where / What time ) did you see her ? – Yesterday morning. 7. We ( are visiting / will visit / visit / visited) Ha Long Bay last summer vacation. 8. Lan sometimes (goes / go / went / is going ) to the zoo. 9. When they (was / will be / were / are ) children, they often played with each other. 10. Yesterday, I ( am buying / going to buy / buy / bought ) many gifts for him on the trip to Ha Noi. 11. The animal programme (showed/ is showing/shows) on VTV3 now 12. Last autumn, I and my friends (went/go/is going) to Nha Trang beach. It was wonderful trip 13. Hurry up, we (missed/misses/are missing) the bus! 14. My uncle (played/plays/is playing) baseball 10 years ago 15. Last year, she (is teaching/teaches/taught) us Math. 16. At the moment, my sister (reads/is reading/read) a comic book. 17. Sometimes, I (am playing/play/played)__________badminton. 18. He usually (goes/is going/went) scuba diving with his friends 19. Jogging (makes/make/is making) us stronger 20. Look! They (run/are running/ran) together.

1) Dogs are (intelligent) than rabbits 2) Lucy is (old) than Ellie. 3) Russia is far (large) than the UK. 4) My Latin class is (boring) than my English class. 5) In the UK, the streets are generally (narrow) than in the USA. 6) London is (busy) than Glasgow. 7) Julie is (quiet) than her sister. 8) Amanda is (ambitious) than her classmates. 9) My garden is a lot (colourful) than this park. 10) His house is a bit (comfortable) than a hotel. Write the correct form of the word in the blanks. – E. 1. He.............reads a book. (quick) 2. Mandy is a.............girl. (pretty) 3. The class is.............loud today. (terrible) 4. Max is a.............singer. (good) 5. The dog barks .................... . (loud) 6. He drives the car ...................... . (careful) 7. She sings the song ..................... . (good) 8. It's a.............day today. (terrible) 9. You can.............open this tin. (easy) 10. He is a.............driver. (careful) Write the correct form of the word in the blanks. –M. 1. She can’t stay (long) …………………….than 30 minutes. 2. Well, the place looks (clean) …………………….now. 3. The red shirt is better but it’s (expensive) ……………………. than the white one. 4. I’ll try to finish the job (quick).……………………. 5. Being a firefighter is (dangerous) ……………………. than being a builder. 6. Lan sings ( sweet ) ………………..than Hoa 7. The weather this summer is even (hot) ……………………. than last summer. 8. Your accent is ( bad ) …………………..than mine. 9. Hot dogs are (good) …………………….than hamburgers. 10. They live in a (big) ……………………. house, but Fred lives in a (big) ……………………. one. 11. My house is(big).............than yours. 12. This flower is(beautiful).............than that one. 13. Non-smokers usually live(long).............than smokers. 14. A holiday by the sea is(good).............than a holiday in the mountains. 15. It is strange but often a coke is(expensive).............than a beer.

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