biết rằng lúc đầu cả tóc và lược nhựa đều chưa bị nhiễm điện, nhưng sau khi chải tóc khô bằng lược nhựa thì cả lược nhựa nhiễm điện âm a, hỏi sau khi chải tóc bị nhiễm điện loại gì ? khi đó các êlectrôn dịch chuyển từ lược nhựa sang tóc hay ngược lại ? b,vì sao có những lần sau khi chải tóc, ta thấy có một vài sợi tóc dựng đứng thẳng lên ?

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I. Choose the best answer to complete the conditional type 1 sentences. 1. If the sun shines today, we _____for a walk. A. will go B. go C. would go D. had gone 2. We ‘ll get wet if we ………….out. A. go B. did go C. went D. had gone. 3. If I go shopping, I ………some food. A. buy B. will buy C. would buy D. would have bought. 4. If I find it, I ………you. A. will tell B. would tell C. had told D. told. 5. You will get a good seat if you _____ first. A. come B. came C. have come D. will come 6. If you cook that kind of food, we _____ it. A. don’t eat B. won’t eat C. wouldn’t eat D. didn’t eat 7. If she _______you, she will tell you the truth. A. will meet B. met C. meets D. would meet 8. She _________out virus covid 19 if she is isolated in a place. A. spreads B. didn’t spread C. will spread D. won’t spread 9*. Sam will phone you_________________________. A. if he doesn’t arrive home B. as soon as he arrives home C. unless he doesn’t arrive home D. when he arrived home. 10*. You won’t pass the examination……………you study more. A. as long as B. unless C. if D. whether. II. Choose the best answer to complete the conditional type 2 sentences. 1. What would happen if you _________to work tomorrow? A. don’t go B. didn’t go C. won’t go D. wouldn’t go. 2. If someone _________in here with a gun, I would be very frightened. A. would walk B. walks C. had walked D. walked. 3. If I were offered the job, I think I _________ it. A. take B. will take C. would take D. would have taken. 4. I would be very surprised if he _________ A. refuses B. refused C. had refused D. would refuse. 5. Many people would be out of work if that factory _________down. A. closes B. had closed C. closed D. would close. 6. If she sold her car, she _________ much money. A. gets B. would get C. will get D. would have got. 7. Would John be angry if I _________his bicycle without asking? A. take B. took C. had taken D. would take. 8. She _________terrible upset if I lost this ring. A. will be B. would be C. were D. had been. 9. They would be disappointed if we _________ A. hadn’t come B. wouldn’t come C. don’t come D. didn’t come. 10. If we didn’t miss the 6: 30 train, we _________home on time. A. would have arrived B. arrived C. will arrived D. would arrive.