Electron tự do cs trong vật nào dưới đây : a) mảnh niloong b ) mảnh nhựa c) mảnh đồng d) mảnh giấy khô

II. Complete the following sentences. Use affirmative or negative of "must". 1. You __________________________ study harder to get better marks. 2. The boy is only twelve years old. He ___________________________ ride a motorbike. 3. Jimmy, you __________________________ bite nails. 4. My classmate is very ill. She __________________________ see a doctor as soon as possible. 5. Your hands are dirty. You __________________________ wash them before meal. 6. We __________________________ brush our teeth at least once a day. 7. Children __________________________ play with dangerous objects like knives and matches. 8. Students __________________________ use mobile phones during the test. 9. Babies ___________________________ go to bed early. 10. You ____________________________ be impolite to elderly people.

Nguồn năng lượng chủ yếu trên trái đất là gì ????

Tính 2021/1.2+2021/2.3+2021/3.4+....+2021/99.100

EXERCISE 1.Write a new sentence with the same meaning.(2) 11. You know a bit about cars, but I know more. You don't .............................. . 12. It's still cold, but it was colder yesterday. It isn't ............................... . 13. I still feel quite tired I felt, but a lot more tired yesterday. I don't ................................ . 14 Our neighbours have lived here for quite a long time, but we've lived here longer. Our neighbours haven't ................. . 15. I was a bit nervous before the interview,but usually I'm a lot more nervous. I wasn't ...............................

Cho 12,4 g Na2O tác dụng với nước thu được 500g dung dịch A . Tính nồng độ%(C%) của dung dịch A

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Giải giúp em Ví Dụ 2 chi tiết với ạ!!!

Sửa lỗi sai các câu sau: 1 One of the most important things in life is a good health. 2. Four out of five tourists who visit the country arrive by air. 3 It worth to point out that this is not the only possible cause of the problem. 4: There has been an increase of interest in classical music in recent years. 5 Only half the people who responded to the survey were satisfied. 6 In the end of the period in question. imports had increased by ten per cent. 7 It can be true that people are living longer. but what about their quality of life? 8 The new airport will be only two and quarter kilometres away from the school. 9 Although you can encourage people to stop smoking, you can't force them to. 10 The training scheme was unpopular, and at the end, the government had to abandon it.

Cho phân số 7/19 . Hỏi phải cộng thêm vào tử số và mẫu số của phân số đó cùng một số tự nhiên nào để được phân số mới bằng phân số 4/6