Hai người cùng làm một công việc .Nếu làm riêng ,người thứ nhất phải mất 4 giờ, người thứ hai phải mất 5 giờ . Hỏi nếu làm chung thì mỗi giờ cả hai người làm được mấy phần công việc?

3. Read the paragraph and fill in the gap with one suitable word: All the world knows William Shakespeare as one of the greatest poets and dramatists. He was (1).................in a small English town of Stratford-upon-Avon and (2) ..............up in a large family of eight brothers and four sisters, but many of them died very (3) ................ His father, John Shakespeare, made and sold gloves. William learned (4).....................a school in Stratford. He married very young (5)......................he was about nineteen, and soon (6).............. to London where he worked at a theater. There he began to write (7)................for the theater, his plays were good and people like (8)..................... Now Shakespeare could help his family in Stratford. He (9)........................thirty-seven plays and some books of poems. At the end of his life he came back to Stratford and (10).....................................there. C. WRITING

Hãy lập các PTHH của các phản ứng theo các sơ đồ sau: a. Zn + HCl ------> ZnCl 2 + H 2 b. Ca + O 2 --- t 0 ---> CaO c. CuCl 2 + KOH ------> Cu(OH) 2 + KCl d. Fe + Cl 2 --- t 0 ---> FeCl 3 e. Al + FeSO 4 ----> Fe + Al 2 (SO

Biểu diễn tập nghiệm của bất phương trình 2x - 3y + 1 > 0.

Bài 1: Quãng đường AB dài 185 km. Lúc 6 giờ, một ô tô chạy từ A về B với vận tốc 45 km/h. Đến 6h20 phút, một ô tô thứ hai chạy từ B về A với vận tố 40 km/h. Hỏi hai xe gặp nhau lúc mấy giờ? Bài 2:Theo kế hoạch một máy bơm nước loại nhỏ phải bơm nước vào ruộng trong 12 giờ. Nhưng do thay máy bươm nhỏ bằng máy bơm lớn, mỗi giờ bơm được nhiều hơn 5m3 nên chẳng những 9 giờ đã bơm xong mà còn vượt mức 3m3 nữa. Hỏi theo kế hoạch phải bơm vào ruộng bao nhiêu mét khối nước?

2. Find a mistake in each sentence and correct it. 1. She asked us learned new words immediately before we left class. A B C D 2. What were you buy at the souvenir shop yesterday? A B C D 3. My brother plays video games twice times a week. A B C D 4. He comes here with bicycle because he does not like walking. A B C D 5. There are a little fruit trees in my grandparents’ garden. A B C D 3. Fill in each gap with ONE suitable preposition. 1. It’s seven thirty and Minh is late_____________school. 2. We must clean hands _____________ having a meal. 3. He's waiting for her_____________the bus stop. 4.“How do you go to school?” - “ _____________ my father’s car.” 5. The population _____________the world is increasing. 4. Put the verbs in brackets in the right form. 1. I don’t live with my family now and we (not/see)________________each other for five years. 2. He (break) ___________ the biscuit in half and gave one piece to me. 3. Japanese (speak)_______________at the meeting tomorrow morning. 4. ______he (watch) _______the news regularly? 5. This is the second time he (lose)___________ his car key.

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hãy vẽ đồ thị của các hàm số y=2x^2 ,y=-2x^2 .dựa vào đồ thị để trả lời các câu hỏi sau : a, nếu a>0 thì hàm số y=ax^2 đồng biến khi nào ? nghịch biến nào? Với giá trị nào của thì hàm số đạt gtnn ? có giá trị nào của x để hàm số đạt giá trị lớn nhất không ?

A. LEXICO-GRAMMAR 1. Choose the best answer to complete the following sentences 1. A: “Those girls are very good at dancing!” - B: “ ___________” A. So do I! B. I know, they are C. Yes, they do! D. They were fine, thanks 2. I occasionally miss the bus so I have to take a taxi instead. A. never B. always C. sometimes D. rarely 3. There isn’t __________ for dinner, so I have to go to the market. A. any left B. some left C. any leaning D. some leaving 4. Public ___________ in this city is quite good, and it’s not expensive. A. journey B.travel C. vehicle D. transport 5. Bicycles ___________ in the driveway. A. must not leave B. must not be leaving C. must not be left D. must not have left 6. The film was so __________. However, my father saw it from beginning to end. A. interesting B. exciting C. boring D. fascinating 7. If the weather _____________ good, I _____________ camping with classmates. A. is / go B. is / will go C. will be / go D. will be / will go 8. Find the word which has a different sound in the part underlined. A. birthday B. mouthful C. breathe D. worth 9. Rob eats a lot of fast food and he __________ on a lot of weight. A. takes B. spends C. puts D. brings 10.You are not allowed to smoke in this hall. A. forbidden B. asked C. let D. made 11. “They listen to the music with great interest” means_____________ A. They enjoy the music. B. They hate the music. C. They dislike the music . D. They never listen to that music. 12. If people turn off all electric appliances in one hour all over the world, they can save lots of ______. A. electric B. electrical C. electrician D. electricity 13. These three Rs __________ reduce, reuse and recycle. A. stand up B. stand for C. ask for D. means 14. He _________ English in this school since he _____________ here. A. has taught/moved B. taught/moved C. taught/ has moved D. has taught/has moved 15. Find the word whose main stress pattern is different from others. A. beautiful B. interesting C. environment D. difference