15. The essay is too long. He can’t finish it in 15 minutes. -> He doesn’t have ________________________________________________________________. 16. I know a few English words. I can’t read a newspaper in English. -> I don’t know __________________________________________________________________

y=2.cos^4x + sin^2x . tìm GTLN,GTNN của hàm số

Một thư viện cần xếp 5628 quyển sách quý giá sách có 11 nhanh, mỗi năm có thể xếp ba hai quyển sách cần ít nhất bao nhiêu các sổ sách trên

cho đường thẳng AB cắt CD tại O có BOC=2.BOD Tính :BOC,BOD,AOD,AOC

Cho e hỏi bấm nút nào để máy tính casio có thể quay về thực hiện cộng trừ nhân chia như trước ạ

Khối lượng NaCl có trong dung dịch nước muối sinh lý 0.9%

giúp ..................................................................................................với

A, Cot ( 3x + 10° ) = cot45° B, Cot3x=cot pi/6

giúp mình với ạ! ( hic ko phiền các bạn có thể trả lời giúp mình: • căn x.(căn x -1) <0 • )

1. He usually (work) very hard, but he (not work) at all today because it’s a holiday. 2. Look! That man (run) out of the bank. And he (carry) a large bag full of money. 3. I (watch) TV when the phone (ring) . 4. After Richard (finish) work, he (go) home. 5. By the time the firemen (arrive) , the fire (already, go out) . 6. When she (be) a child, she always (want) to do the most dangerous things. 7. Water (boil) at 100 degrees Celsius. 8. I’m sorry I (forget) to do my homework yesterday. 9. We (not see) any interesting films lately. 10. The film (begin) when we arrived at the cinema. 11. I think I (lose) my door key. I can’t find it anywhere. 12. Eric (not find) a flat yet, so he’s still living with his parents. 13. They (start) running their own company in 1980. 14. When the match was over, the spectators (go) home. 15. The phone (ring) suddenly while Joanne was doing the housework. 16. I (study) ________________ English for three years 17. Up to the present, we (write) ________________ almost every lesson in the book. 18. I (not see) ________________ him since last Monday. 19. George (work) ________________ at the university so far. 20. My father (not smoke) ________________for 5 years. 21. You (receive) ________________ any letter from your parents yet? 22. Jim sends his love. I (just, see)________________ him in the high street. 23. When the police (arrive) _____________________, the robbers had gone. 24. When I arrived the students (already, go) _____________________ into class. 25. Miss Davis (type) _____________________ letters after manager (come)__________________ back. 26. My roommate had finished dinner by the time I (get) ____________________ home. 27. They (go) _____________________ home after they (finish) _____________________ their work. 28. Before she (watch) ____________________ TV, she (do) _____________________ her homework. 29. When she (be) a child, she always (want) to do the most dangerous things.