13. Ba ____________his room yesterday afternoon. A. tidied B. were tidying C. will tidy D. tidies 14. What ____________ yesterday at 10.20 pm? A. are you doing B. was you doing C. were you doing D. did you do 15. When I ____________you last night, what you ____________? A. see/ did you do B. saw/ are you doing C. saw/ were you doing D. was seeing/ did you do 16. My father ____________us to go out in the boat before he came home yesterday. A. didn’t allow B. hadn’t allowed C. doesn’t allow D. hasn’t allowed 17. Since the boys broke a window, they____________ very nervous. A. are feeling B. have felt C. had felt D. felt 18. Mr. John____________ to Los Angeles in 1992. A. had gone B. has gone C. went D. was going 19. While I was going to school yesterday, I____________ him. A. am meeting B. met C. will meet D. meet 20. I ____________ about him when suddenly he came in the room. A. talk B. talked C. am talking D. was talking 21. It began to rain when they ________________basket ball. A. play B. are playing C. were playing D. is playing 22. He ______ email before, so I ______ him how to use it. A. did not use / had shown B. had not used / showed B. has not used / showed D. was not using / will show 23. As soon as you __________ your homework, you will be allowed to go out. A. are doing B. had done C. have done D. did 24. Don’t come ____________ I have finished lunch. A. after B. as soon as C. since D. until 25. By the time I ________ the party last night, David _________. A. arrived/ had left B. arrive/ will have left C. had arrived/ had left D. arrived / left

tìm tập xác định của hàm số y=√(1+cos x/1-sin x)

dân số tăng nhanh và đông có khó khăn j trong kinh tế xã hội của châu á

So sánh câu " Nuôi đủ năm con với " một chồng " ( ngữ văn 11 - Thương Vợ ) tại sao năm con " lại cân bằng với câu " một chồng "

giúp em làm hết đống này với ạ, em cảm ơn nhiều :((

Phân tích đa thức thành nhân tử cần gấp ạ

Yoga increases endurance,____and flexibility. A. blood B. powerful C.strength D.strong

ai giải giúp em hai bài này với

. They lost the match, although they were a better team. (despite) …………………………………………………………………………………. 2. We didn’t go fishing because the water was rough. (because of) …………………………………………………………………………………. 3. She stayed at home because of her mother’s sickness. (because) …………………………………………………………………………………. 4. Although Mr. David is rich, he couldn’t afford to buy such a villa. (in spite of) …………………………………………………………………………………. 5. Although his both legs were broken in the crash, he managed to get out of the car before it exploded. => Despite his………………………………………………………………….. 6. The children couldn’t go swimming because the sea was rough. => The sea was too………………………………………………………………………. 7. He couldn’t afford to buy the car. => The car……………………………………………………………………….. 8. Although he had a good salary, he was unhappy in his job. => In spite of……………………………………………………………………………….. 9. That restaurant is so dirty that no one wants to eat there. => It is such………………………………….. 10. I couldn’t hear them because they were speaking too softly. => They were speaking……… 11. The bread is so tale we can’t eat it. => The bread isn’t………. 12. The furniture was so expensive that I didn’t buy it. => The furniture was too…………………………………………………. 13. It was so late that nothing could be done. => It was too……………………………………………………………… 14. He left school and then joined the army. => After ………………………………………………………………… 15. We couldn’t drive because of the fog. The fog prevented………………………………………………………. 16. Although his leg was broken he managed to get out of the car. In spite………………………………………………………………

Cho m gam ( nhôm axit) Al203 tác dụng hoàn toàn với 600ml dd h2so4 tạo thành dd Al2(SO4)3 (Nhôm sunfat) 0,05M.Tính m?