Cùng với sự phát triển của sản xuất và phân công lao động ở buổi đầu thời đại dựng nước Văn Lang, xã hội có những thay đổi ra sao?

20 điểm lun đó trả lời nhanh nha

EXERCISE 3: Choose the underlined part in each sentence (A, B,C, or D ) that needs correcting 1.Debbie, whose father (A) is an excellent tennis player(B), has been (C) playing tennis since (D) ten years. 2. Recently, the island of Hawaii (A) had been (B) the subject of intensive research (C) on the occurrence (D) of earthquakes. 3. Every morning, the sun shines (A) in my bedroom window (B) and waking (C) me up (D). 4. Caroline has worn (A) her new yellow (B) dress only once (C) since she buys (D) it. 5. My friend didn’t drink (A) any (B) beer since we came (C) to live here (D). 6. We have written (A)to each other (B) when (C) we were (D) in primary school 7. What will (A) you do (B) when (C) your friends won’t come (D) ? 8. Someone was knocking (A) at the door (B) when I was doing (C) the washing up (D).

giải phương trình: x^3+(x+1)^3+(x+2)^3=(x+3)^3

Tìm số nguyên X biết: (X+5)+(X-9)=X+2

Mấy bạn làm ơn giúp mình bài này với

EXERCISE 2: Choose the best answer among A, B, C, or D. 1. When I last saw him, he _____ in London. A. has lived B. is living C. was living D. has been living 2. We _______ Dorothy since last Saturday. A. don’t see B. haven’t seen C. didn’t see D. hadn’t seen 3. The train ______ half an hour ago. A. has been leaving B. Left C. has left D. had left 4. Jack ______ the door. A. has just painted B. Paint C. will have painted D. painting 5. My sister ________ for you since yesterday. A. is looking B. was looking C. has been looking D. looked 6. I ______ Texas State University now. A. am attending B. Attend C. was attending D. Attended 7. I _______ in the room right now A. am being B. was being C. have been being D. am 14. I ______ to New York three times this year. A. have been B. Was C. Were D. had been 15. I’ll come and see you before I _______ for the States. A. leave B. will leave C. have left D. am leaving 16. I have never played badminton before. This is the first time I _____ to play. A. try B. Tried C. have tried D. am trying 17. Since _______, I have heard nothing from him. A. he had left B. he left C. he has left D. he was left 18. He will take the dog out for a walk as soon as he ______ dinner. A. finish B. Finishes C. will finish D. finishing 19. He always ________ for a walk in the evening. A. go B. is going C. Goes D. going 20. Her brother ______ in Canada at present. A. working B. Works C. is working D. work

Tìm từ trái nghĩa với các từ sau

EXERCISE 1: Use the correct form of verbs in brackets. 1.He sometimes (come) __________ to see his parents. 2. I (visit) __________ my uncle's home regularly when I (be) __________ a child. 3. That book (be) __________ on the table for weeks. You (not read) __________ it yet ? 4. David (wash) __________ his hands. He just (repair) __________ the TV set. 5. You (be) __________here before? Yes, I (spend) __________ my holidays here last year. 6. It (rain) __________ hard. We can't do anything until it (stop) __________ 7. Last night we (watch) __________TV when the power (fail) __________. 8. London (change) __________a lot since we first (come) __________ to live here. 9. While we (talk) __________on the phone the children (start) __________fighting and (break) __________a window. 10. I (spend) __________ a lot of time travelling since I (get) __________this new job. 11. At the moment, I(read)_______________a book and my brother (watch)_______ TV. 12. Ha never (go)______________fishing in the winter but she always (do)___it in the summer. 13. She (like )________________Tea, but she (not like)____________________coffee. 14. My father (go)___________ to work by bike. Sometimes he(walk)______________. 15. Now I (do)_____________the cooking while Hoa (listen)_______________to music .

15 người thợ Định làm xong công việc trong 20 ngày nhưng mới làm được 1/5 số ngày A hỏi 15 người muốn hoàn thành công việc phải mất bao lâu nữa B nếu có 5 người xin nghỉ việc thì công việc sẽ hoàn thành chậm bao nhiêu ngày