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Bạn Huệ ngồi trên một ô tô chạy với vận tốc 45km/giờ nhìn thấy một tàu hỏa dài 100m đi ngược chiều qua mắt mình trong thời gian 3 giây. Tính vận tốc tàu hỏa.
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GIÚP MIK!!!!!!!!!!!!! 1.Be careful to cover the _______________ sockets for the safety of the children. (electric) 2. Every ______________ in my neighborhood has at least a TV set. (house) 3.Hard work always brings _______________. (succeed) 4. She is often worried about the _____________ of all electric appliances in her house. (safe) 5. In order to save ________, remember to turn off all the lights in the room before you leave. (electric) 6. You should obey the ______________ regulations at the hospital yesterday. (safe) 7. The __________________ victims were sent to the hospital yesterday. (injure) 8. You have to keep all _______________ objects out off the children’s reach. (danger) 9. A kitchen is not a _________________ place to play. (suitability) 10. Heat gradually __________________ vitamin C. (destruction 11.It’s a ___________ ___ idea for children to do some working at early age.(marvel) 12.Most teenagers like taking part in ________________ service. (communal) 13. Warm clothes are _____________________ for hot weather. (suit) 14. The __________________ of atom bomb is very terrible.(destroy) 15. You must put all the ____________________ in a cupboard.(chemistry) 16. These are some ___________________ precautions in the home. (safe) 17. I’m going to the shop for a rice ________________. What brand do you recommend ?(cook) 18. He works as a(n) ___________________. (electricity) 19 A __________________a strong metal box or cupboard with a complicated lock, used for storing valuable things in, for example, money or jewellery. (safe) 20. We must reach a(n) _________________ soon. (agree) 21.Kitchen isn’t a ________ _________ place to play in. (suit) 22. Kitchen is a(an) ________ _________ place to play in. (suit) 23. Did you take your ____ ________? (medical) 24. I can’t finish this task without your_____ ____ ____. (encourage) 25. Ha Long Bay is one of the most famous tourist ______ _. (attract) 26. She brought me a(n) _______ _____ kettle as a gift.(electricity) 27. His room is full of ___________ (dirty) 28. She __________ everybody with a beautiful smile last night. (attractive) 29. When the ___________went out, he struck the match to find the candles.(electric) 30. His __________ became worse because he ignored the doctor’s advice. (injure) 1. What was your former teacher like? what………………………………………………………….. 2. Miss. Cathy enjoyed talking about her favorite sport. Miss. Cathy…………………………………………………. 3. Peter is very young. He can not ride a motorcycle . Peter is not………………………………………………… 4.No one in my class is more beautiful than her. She is ……………………………………………………… 5. It’s unnecessary for you to wake up so early. You don’t………………………………………………….. 6. You are not allowed to make noise here. You mustn’t ………………………………………………. 7. Don’t stay up late every night. You shouldn’t……………………………………………… 1.it’s better for you to review what you have learned. You should………………………………………………….. 2. I advise you to keep your house clean and tidy. You ought………………………………………………….. 3. How much is the tall building? How………………………………………………………… 4. Yesterday the temperature was nine degrees. Today it’s only six degrees. It’s …………………………………………………………… 5. Chris and Joe both did badly in the exam. Chris got 20% but Joe only got 15%. Joe did …………………………………………………….. 6. I expected my friends to arrive at about 4 O’clock. In fact they arrive at 2.30. My friends …………………………………………………… 7.They have posted the letter for you. The letter …………………………………………………..…………

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