Giúp mình 2 câu này với 3) Mặt sáng tầng một của ngôi nhà cao hơn mặt sân 0,5 m.Cầu thang đi từ tầng một lên tầng gồm 21bậc , mỗi bậc cao 18 cm a) Viết công thức để tìm độ cao của một bậc tùy ý so với mặt sân b)Tính độ cao của sảng tầng 2 so với mặt sân. 4)Từ 0 giờ đến 12 giờ trưa , đồng hồ đánh bao nhiêu tiếng? Biết rằng nó chỉ đánh chuông báo giờ và số tiếng chuông báo giờ và số tiếng chuông bằng với số giờ

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1. He can’t go out because he has to study for his exam. => If………………………………………………….. 2. She is lazy so she can’t pass the exam. If………………………………………………………… 3. He will pay me tonight; I will have enough money to buy a car. => If……………………………………………………………. 4. He smokes too much; that’s why he can’t get rid of his cough. => If…………………………………………………………….. 5. She is very shy, so she doesn’t enjoy the party. => If…………………………………………………………….. 6. I will get a work permit. I will stay for another month. => If…………………………………………………………….. 7. He doesn’t take any exercises. He is so unhealthy => If………………………………………………………………. 8. We can’t get the ticket because I don’t have the right change. => If……………………………………………………………….. 9. Study hard or you won’t pass the exam. => If………………………………………………………………….. 10. Don’t be impatient or you will make mistakes. => If…………………………………………………………………….. 11. I didn’t eat lunch, I feel hungry now. => If I…………..…………………………………. 12. I only come if they invite me. => unless………………………………………………. 13. He didn’t revise all his lessons, he failed the exam. => If he……………………………………………………….. 14. The park is over there, only 5 minutes’ walk. => If you walk………………………………………………. 15. Leave me alone or I’ll call the police. =>Unless…………………………………………………………………………………… 16. If you arrive at the office earlier than I do, please turn on the air-conditioner. => Should………………………………………………………………………………. 17. The children don’t go to school in the snowy weather. => If it ……………………………………………………………………………… 18. He died so young; otherwise, he would be a famous musician by now. =>Had ……………………………………………………………………………… 19. You must tell me the whole truth or I won’t help you. => Unless…………………………………………………………………………… 20. The car breaks down so often because you don’t take good care of it. => Were I…………………………………………………………………………… 21. He is very bad-tempered, that’s why his wife left him soon after marriage. => If he……………………………………………………………………………… 22. Don’t tell lies to your boss or you’ll be fired at once. => If…………………………………………………………………………… 23. She got married at such an early age: otherwise, she would be at university now. => Had ………………………………………………………………………….