II. Bài tập viết lại câu thì hiện tại hoàn thành và quá khứ đơn 15. When did he last talk to you? → How long ………………………………………………… 16. When did you last telephone him? → Hong long ………………………………………………… 17. We have never eaten this kind of food before. → It’s the ………………………………………………… 18. This is the first time I have seen this film. → I have never………………………………………………… 19. This is the first time he went abroad. → He hasn’t ………………………………………………… 20. She started driving 1 month ago. → She has ………………………………………………… 21. We began eating when it started to rain. → We have ………………………………………………… 22. I last had my hair cut when I left her. → I haven’t ………………………………………………… 23. The last time she kissed me was 5 months ago. → She hasn’t………………………………………………… 24. It is a long time since we last met. → We haven’t………………………………………………… 25. When did you have it ? → How long………………………………………………… 26. This is the first time I had such a delicious meal . → I haven’t………………………………………………… 27. I haven’t seen him for 8 days. → The last………………………………………………… 28. I haven’t taken a bath since Monday. → It is………………………………………………… 29. It's 2 years since I had a future. → I have ………………………………………………… 30. It's 2 months since he earned any money. → He has …………………………………………………

giúp em với ạ ( hứa sẽ vote đủ ) :((

(2x+y)² (x-1)² (x-4)² làm giúp em vs ạ giải thích cách ra kết quả vs ạ

Câu nào đúng, câu nào sai Eg. True Or False I very like playing games. Are you live in HCM city? I happy. Do you happy? Does she feel tired? Where do you live? What do you do for a living? I drink a lot of water every day. Giúp mik với!!!!!!!!!

giúp em với ạ ( hứa sẽ vote đủ ) :((

27/She.......blood twenty times so far. A.donates B.has donated C.is donating D.to donate 28/He.....lectures to foreign about traditional food and games recently. A.gives B.gave C.have given D.has given 29/They have decided to clean up the neighborhood..........it is full of rubbish. A.so B.but C.although D.because 30/"Have you ever...........to SA Pa"? A.gone B.been C.seen D.visited

Trên tia ox lấy các điểm a ,b ,C a = 6 cm, OB = 3 cm, OC = 9 cm a, so sánh AB và AC b, chứng tỏ b là trung điểm của oa c chứng tỏ a là trung điểm của BC ê

Nêu hiên tượng, viết PTHH giải thích: 1)Nhỏ dd NaOH dư vào dd CuSO4,sau đó nhỏ tiếp dd HCl vào chất sản phẩm 2)Nhỏ từ từ dd AgNO3 vào ống nghiệp có chứa dd HCl 3)Nhỏ từ từ ddBaCl2 ống nghiệp có chứa dd H2SO4 4)Nhỏ dd HCl vào một mẩu đá vôi có tp (CaCO3) 5)Cho 1 mẩu giấy quỳ tím vào cốc chứa dd NaOH, sau đó nhỏ đến dư tiếp dd HCl vào. 6)) Cho 1 lá Cu vào cốc dd H2SO4 đặc rồi đun nóng 7)Nhỏ dd H2SO4 đặc vào cốc có chứa đường saccarozo

I. Give the correct form of the words in brackets. 1. The noise in the city kept Hoa...............................................at night. (Wake) 2. In...............................................to that, my bike tires was flat. (Add) 3. Mr. Tan has a very......................................................tooth. (Pain) 4. Then, Thanh....................................a pan and stir-fried the beef. (Hot) 5. Sugar is not an..................................food because we need it to live. (Health) 6. Catching the common cold is........... .......for every body. (Please) 7. Don't worry! Your cold will last for a few days and then...................... ( Appear) 8. I have......................................time to play than my friend. (Little) 9. Mr Pike didn’t go to work yesterday because of his… ……….……….… (ill) 10. Tra Giang is one of the most famous….………of Viet Nam. Many people love her. (act)

III. Modal verbs: S + modal verb + V(bare inf.) 1. It isn’t necessary for you to wake up early. => You don’t ___________________________________________________ 2. You are not allowed to make noise here. =>You mustn’t _________________________________________________ 3. Don’t stay up late every night. => You shouldn’t _______________________________________________ 4. It’s better for you to review what you have learned. => You should _________________________________________________ 5. It’s necessary to revise new words regularly. =>You should _________________________________________________