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giải hộ mình cái này nhé mọi người

VI. Complete the sentence with the past simple or past perfect form of the verb in brackets. 1. They (live) in Paris for 10 years before they (move) home. 2. As soon as I (download) the document, I knew I (make)a mistake. 3. Mary (ring) John’s doorbell at 8:15 yesterday but John (already/ leave) the house. 4. By the time the firemen (arrive), the fire (destroy)three houses. 5. Our economy (not stand) a chance of developing before thegovernment (adopt) the open-door policy. 6. When I last (speak) to her, she still (not finish)her assignment. 7. Nobody (come) to the meeting because Angela (forget)to tell them about it. 8. She (go) to Disneyland three times when she (be) a little girl. 9. After I (complete) the form, I (give) it to the secretary. 10. Sarah (drive) three hundred miles by the time she (arrive)in Tacoma.

Bài 5. Rewrite each of the following sentences so that it means the same 1, What is your brother is favorite sport? What ................... 2, He is the best at playing football in the club Nobody ........... 3, How much does this television cost What......... 4, She is beautiful dancer She.............

Một máy bay đang ở độ cao 10km. Khi máy bay hạ cánh, phi công muốn đường bay tạo với mặt đất một góc nghiêng 10 độ thì cách sân bay bao nhiêu km phải cho máy bay bắt đầu hạ cánh? Nếu vận tốc khi hạ cánh là 210km/h thì máy bay cần bao nhiêu phút để tiếp đất

C= $\frac{1}{3}$ +$\frac{1}{3^2}$ +...+ $\frac{1}{3^99}$ $\frac{1}{3}$ +$\frac{1}{3^2}$ +...+ $\frac{1}{3^99}$ (phân số cuối là 3^99 nha) Chứng minh: C < $\frac{1}{2}$

Cho tam giác abc vuông tại a có sin C= $\frac{1}{cos B}$ . Tính tỉ số lượng giác của hai góc trên

2. Put the verbs in the Past Simple or Past Perfect. 1. Karen (not want) to come to the cinema with us because she (already/ see) the film. 2. When the students (do) the experiment, they (write) a report on it. 3. “Was Tom at the party when you arrived?” - “No, he (go) out. 4. Sorry I’m late. The car (break) down on my way here. 5. I (take) the book back to the library when I (read) it. 6. Yesterday morning I (remember) the answer to the question Bob (ask) ___me the night before, so I (phone) him. 7. Last night, I (go) to Jim’s room and (knock) on the door but there (be) no answers. Either he (go) out or he (not want) to see anyone. 8. Angela asked me how to use the photocopier. She (never/ use) it before, so she (not/ know) what to do 9. I (live) in Texas for 4 years before I (move) California. 10. When Mr. Smith (wake) yesterday morning, breakfast (already be) ready. 11. Before I (get) promotion, I (work) very hard. 12. Yesterday, my mother (pick) me up from school before we (go) shopping together. 13. Our grandparent (tell) us that he (serve) in the army in 1945. 14. After having dinner with my boyfriend, I (go) in front of such large 15. Yesterday (be) the first time Jane (perform) audience. 16. Peter (admit) he (break) my favorite vase the day before. 17. What (you/ do) before you (come) there? 18. Yesterday I (feel) nervous as I (not prepare) my presentation carefully. 19. (Peter/ come) to see you after he (finish) his work? 20. When she (finish) her work, she (go) to the cinema.

thực hiện phép tính (x^2-x^3).(x-5) (2x+y^2)(2x-y^2)

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