Mực nước trong bình chia độ ban đầu là 250cm3, khi thả chìm một hòn đá vào thì nước dâng lên tới vạch 425cm3. Thể tích của hòn đá là bao nhiêu ?

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Em đang rất cần gấp ạ mong mn giúp em ạ Ex 4. Use the correct tense or form of the verb in parentheses : 1. I am sorry what (happen) last week. 2. He always (travel) _______________ to work by motorbike. 3. Many people (attend) _________________ the meeting tomorrow night. 4. She (be) ______________ here since Christmas. 5. When we (come) ___________ to the party last night, many people (dance) _______________. 6. The sea (cover) ______________ most of the world’s surface. 7. You must (meet) ________________ before. 8. She’ll come and visit her old grandparents before she (leave) _____________ here. 9. John moved into a new flat so that he could (perfect) _______________ his English. 10. My father (turn) ________________ on the television so that he could see the news. 11. You will be late if you (not hurry) ___________________. 12. What time (your train / leave) __________________________ tomorrow ? 13. It’s a secret between them. He promises he (not tell) ________________ anybody. 14. “Did you phone Kate ?” – Oh no. I forgot. I (phone) ________________ her now. 15. I (get up) _________________ early yesterday so as to catch the first bus. 16. Who (look after) _______________ the children when your sister (be) ____________ away ? 17. He promised he (leave) _______________ before the sun (rise) _______________. 18. When I (see) _____________ Mr. Pike tomorrow, I (give) _____________ him your message. 19. They (move) _______________ to their new house at Christmas last year. 20. Thanks for (let) _____________ me (borrow) _____________ your camera. I (bring) _______ it back to you after I (return) ________________ from the library. Ex 13.. Rewrite the sentences. 1. “Don’t play computer games too much,Nam”,She said ->She asked…………………………………………….. 2. He often went fishing when he was young. -> He used………………………………………………..