1. They (go) __ _ home after they (finish) ___ _ their study. 2. Yesterday when I (arrive) _______ to the party, they (already go) __home. 3. After the guests (leave) __ ________, she (go) ____ ______back into the living-room and (switch) __ ________off the light. 4. On arrival at home I (find) ___ _that she (just leave) _____ _____just a few minutes before. 5. Before he (go) _____ _ to bad, he (do) __ ________his homework. 6. When they (get) ____ ______to the place, the man (die) ______ 7. He (do) __ _______ nothing before he (see) ____ ___ me. 8. He (thank) ____ ______ me for what I (do) ____ ______ for him. 9. I (be) ___ _______ sorry that I (hurt) _ __ him. 10. After they (go) _ _, I (sit) _ _down and (rest) _ 11. When I (arrive) ___, the dinner (already, begin) 12. My friend (not see) ______me for many years when I (meet) __ last week. 13. He (learn) __________ English before he (leave) __________ for England. 14. In England, he soon (remember) __________ all he (learn) __________ before. 15. They (tell) __________ him they (not meet) __________ him before. 16. He (ask) __________ why we (come) __________ so early. 17. She (say) __________ that she (already, see) ___________ Dr. Rice. 18. By the time Bill (get) __________ there, the meeting (start) __________. 19. When we (arrive) __________ at our place, we (find) __________ that a burglar (break) ________in. Almost everybody (leave) _______ for home by the time we (arrive) _______.

bài 19 ạ mong mn làm cho dễ hỉu ( đg làm tắt) thank

trên cùng một nữa mặt phẳng bờ chứa tia ox vẽ tia oy,oz sao cho xoy=50,xoz=120 a) tính yoz b) vẽ tia on ,om lần lượt là tia phân giác của xoy,yoz. Tính nom c) vẽ tia ot là tia đối của oz . Tia ox có phải là tia phân giác của yot không , vì sao

Giải giúp em với ạ ( có lời giải với ạ )

Làm cho em câu 8,9,10 nếu làm được nữa thì câu 11 cũng được

Một số tinh bào bậc I của thỏ giảm phân đã tạo ra tổng số 288 tinh trùng. Các tinh trùng có chứa tổng số 6336 NST. Các tinh trùng đều tham gia thụ tinh với hiệu suất 12,5%. Xác định: a) Số tinh bào bậc I và số NST có trong hợp tử tạo thành b) Nếu hiệu suất thụ tinh của trứng là 50 % thì sẽ cần bao nhiêu tế bào sinh trứng? Em cần gấp lắm ạ

Cho e hỏi ngu cái là trong hệ tọa độ ko gian Oxyz thì có đổi Vecto pháp tuyến thành chỉ phương như trong hệ Oxy đc ko ạ Tại e thấy ng ta tính ''Tích có hướng của cặp vecto'' . Ai giải thích giúp e cái đó với.

giúp mik với pls mình đà cần gấp lắm ạ !

Ex1:Choose the best answer. 1. He books for poor children for years A. has collected B. collects C. is collecting D. collected 2. Ngoc loves outdoors with trees and flowers. A. is B. be C. being D. was 3. _______ your homework yet? A. Are you doing B. Have you done C. Do you do D. Did you do 4. She _________________ this film already. A. am seeing B. have seen C. saw D. has seen 5. Nam Cao _______________ a lot of novels. A. has written B. writes C. wrote D. writing 6. Her mother _____________ three books. She is going to start the fourth one soon. A. has written B. writes C. wrote D. written 7. I think I ____________ him before. A. meet B. met C. have met D. meeting 8. Oh, yes! Now I remember. I ____________ him when I was in Hoi An. He was our guide! A. meet B. met C. have met D. will meet 9. I blood twice, and presents to sick children in the hospital recently. A. donate - give B. donated - gave C. have donated - have given D. have donated – gave 10.She blood twenty times so far. A. donates B. has donated C. is donating D. to donate 11.Let’s help the street children because they have bad . A. live B. living conditions C. ways of life D. earnings 12.They have decided to ride to work it is good for their health and the environment. A. so B. but C. although D. because 13. I’ve ________ seen this film. Let’s watch something else. A. never B. ever C. already D. yet 14. We can help to reduce ________ by using public transportation, biking and walking. A. air pollution B. water pollution C. social problems D. community service 15._______ do you do volunteer work? - Every weekend. A. How long B. How far C. How much D. How often Ex 2 : Choose the correct word A, B or C for each gap to complete the following passage. (1) January 17th, 1995, a powerful earthquake hit the city of Kobe, Japan. Many buildings (2) or collapsed. Soon after the earthquake, people in Kobe (3) working together to save their city. Neighbours pulled each other out (4) collapsed buildings. Ordinary people (5) out fires even before the fire trucks arrived. Volunteers in Kobe organized themselves into (6) . They worked out a system to send (7) to people who needed. Other teams searched for belongings in damaged stores and homes. Some people (8) food, water, clothes, and electric generators to different part of the city. Some volunteers took (9) of children who had lost their parents. Teams of volunteers from outside Japan helped, too. Today, Kobe has been built. But people there still remember the outpouring of support they (10) from all over the world back in 1995. 1. A. in B. at C. on D. from 2. A. is burning B. burned C. burning D. burn 3. A. to begin B. are beginning C. begin D. began 4. A. into B. of C. on D. with 5. A. to put B. putting C. puts D. put 6. A. teams B. pair C. group D. friends 7. A. helped B. helping C. help D. to help 8. A. brought B. bringing C. brings D. brought 9. A. part B. care C. caring D. note 10.A. received B. is receiving C. have received D. receiving

Giúp mk nhanh vs ạ.Mk đag cần gấp lắm Mk hứa sẽ đánh giá 5* cho Nhanh nhanh giúp mk nhé.Mk cảm ơn🙏🏻