Hãy giải thích tại sao pha đèn pin, ô tô hay xe máy lại dùng gương cầu lõm chứ không dùng gương phẳng hay gương cầu lồi ?

Complete these sentences with the correct word “for”, “during”, “while” or “meanwhile”. 49. He’s been on holiday ............................ three weeks. 50. ............................ that time, he’s visited his relatives in Australia. 51. ............................, I’ve been doing his work. 52. ............................ he has been on holiday, I’ve been doing his work. 53. I’ve been doing his work ............................ the time he has been away. 54. The crisis arose ......................... the Managing Director was on holiday and lasted ......................... the duration of his absence. 55. The crisis arose ......................... the Managing Director’s absence on holiday. He went to sea ............................ a few days in his yacht; ............................, his colleagues were attempting to resolve the problems without him because they were unwilling to disturb him ............................ he was away. 56. When he returned, he was very angry. ‘Good heavens,’ he said. ‘I’ve only been away ............................ a fortnight but ............................ my absence, everything seems to have gone to pieces. There I was, sailing peacefully around the Mediterranean, and ............................, ............................ the time I was away, you were trying to solve these problems without telling me.’

Viết một đoạn văn hội thoại có sử dụng tình huống vi phạm phương châm về lượng hoặc về chất ???

Khai triển biểu thức câu d vs câu e

Bài 4: Tìm lỗi sai 1. Yesterday I meet Mr. Tan at the supermarket. He bought some cloths for the festival this morning 2. My best friend get the accident last night. He is staying at home now. 3. I often went to the library to borrow books on weekend. 4. Look! A horse runs on the street 5. He already finishes his homework. 6. My brother asks me to pick up him at the dormitory 3 hours ago 7. Where is Tony, Jane? He taking some photographs in the garden! 8. The earth was a planet. 9. We miss the bus. Now we'll have to walk. 10. Why didn’t Tom went to school this morning? Because he was sick Bài 5: Viết lại câu 1. often/ I/ the/ museum/ Saturday/ visit/ on 2. 3 years/ my / died/ ago/ neighbor/ because/ accident/ got /an 3. cooking/ sister/ in/ my/ is/ dinner/ kitchen/the 4. do not/ Jane/ usually/ breakfast/ morning/ in the/ have. 5. tired/ I/ when/ cycle/ to/ school/ am/ always/I 6. reused/ recycle/ we/ bottles/ can? 7. Anything/ She/ here/ has been/ never/ she/ but/ buys/ several times/ in. 8. Ever/ you/ been/ Australia/ have/ in?

Trên cùng một nửa mặt phẳng bờ là đường thẳng chứa tia Ox, xác định tia Ot và tia Oy sao cho xOt=40độ; xOy= 80 độ B) Vì sao có thể khẳng định rằng góc xOy chỉ có một tia phân giác ???

Chứng minh rằng : 434 + 435 chia hết cho 44

Bài 2: Tìm đáp án đúng 1. Do you know Janelyn? Yes, of course, I (met/ meet/ is meeting) her every day! 2. I ( am / was / were ) very happy on my last vacation. 3. Where is Tom? Ah! he ( is playing/ plays/played) football with his friends in the garden 5. He ( doesn’t / won’t / didn’t ) come here tomorrow. 6. (When / where / What time ) did you see her ? – Yesterday morning. 7. We ( are visiting / will visit / visit / visited) Ha Long Bay last summer vacation. 8. Lan sometimes (goes / go / went / is going ) to the zoo. 9. When they (was / will be / were / are ) children, they often played with each other. 10. Yesterday, I ( am buying / going to buy / buy / bought ) many gifts for him on the trip to Ha Noi.

chuyển sang câu hỏi gián tiếp: were you here yesterday? =>she wanted to know . . . .

giúp mình bài này với mình cần gấp lắm !!!!!!!!!!!