các cậu ơi cho mik hỏi tại sao câu ''Who look after the children for you ? '' chuyển sang bị động lại là ''By whom are the children looked after for you? '' với ạ 

Bài 1. một vật chuyển động thẳng đều với vận tốc 5m/s. • A. tìm quãng đường vật đi được trong 1 giờ • B. tìm thời gian vật đi hết quãng đường 2km

Bài 2. lực 20N được biểu diễn bằng vec tơ dài 2cm. Thì lực 50N được biểu diễn bằng vec tơ dài bao nhiêu? •

Bài 3. tính và vẽ các lực tác dụng vào cái tủ lạnh có khối lượng 80kg đang đặt trên mặt đất •

Bài 4. tìm tốc độ trung bình của vật biết trong một phần tư quãng đường đầu vật chuyển động với vận tốc 10 m/s còn trong ba phần tư quãng đường còn lại vật chuyển động với vận tốc 72 km/h

. VOCABULARY – GRAMMAR – LANGUAGE FUNCTIONS I. Choose the correct option (A, B, C or D) to complete each of the following sentence (10 points). 1. Without your help, I years ago. A. will give up B. give up C. gave up D. would have given up 2. Her being born in a poor family her from having proper schooling. A. prevents B. protects C. disables D. helps 3. The will was found three days after his _ . A. die B. died C. death D. dead 4. Your son’s behavior is in the whole school. A. bad B. the worst C. worse D. badly 5. The young generation likes using mobile phones, the devices _ _ help them to communicate with their friends quickly. A. who B. that C. what D. they 6. He lost control of the car and drove _ the river. A. in B. on C. over D. out of 7. The beauty of Ha Long Bay the tourists in the summer carnival last year. A. impress B. impressing C. impression D. impressed 8. The first hamburgers were sold in Connecticut in 1895 by an American chef Louis Lassen. A. was called B. has been called C. is called D. called 9. The teacher suggests something for the poor in our neighborhood. A. us to do B. us should do C. we should do D. we doing 10. Math, Literature and English are _ subjects in high schools. A. adding B. optional C. compulsory D. religious 11. I _ about him when suddenly he came in. A. was talking B. talked C. am talking D. have talked 12. Bill asked where _ from. A. do I come B. did I come C. I come D. I came 13. Jane said that you had read the book three times. – Yes, I found it very . A. amused B. amusing C. amuse D. amusingly 14. I’d rather to the party with my parents because there was nothing interesting there. A. not be invited B. not have been invited C. hadn’t been invited D. haven’t been invited 15. I prefer playing soccer on TV. A. to watching B. than watching C. to watch D. than watch 16. Hoa: It’s very nice of you to meet me here. - Lan: _. A. It’s a pleasure B. You’re welcom C. Certainly D. No problem 17. Ba: Shall I warm the milk for you? - Nhung: . A. Yes, you shall B. No, you shan’t C. No, please D. Yes, please 18. Mom: Will you empty the basket for me, please? - Son: . A. Thanks, Mom B. Yes, please C. Yes, certainly D. Yes, you will 19. Peter: Oh, I’m sorry. - Jimmy: _ . A. Great B. That’s all right C. It’s nice of you D. Thank you