tại sao lau kính bằng khăn vải khô ta thấy không sạch bụi a) cả 3 câu đều sai b) vì khăn vải khô làm kính bị trầy xước c) vì khăn vải khô ko dính đc các hạt bụi d) vì khăn vải khô làm kính bị nhiễm điện nên sẽ hút các hạt bụi và các bụi vải giúp mình với ạ, mình cảm ơn

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PART 4: WRITING 1. Make sentences using the words and phrases given. 1. Our / volunteer / in / communities / make / difference. 2. I / like / take / part / volunteer / work / because / I / think / it / useful / meaningful / society. 3. We / should / help / homeless / elderly / abandoned / children. 4. I / volunteer / for / five / years. 5. Last week / my class / volunteer / clean / streets. 6. I / feel / more / confident / after / participate / volunteer / work. 7. My brother / ever / donate / blood / three times / before. 8. Every year / we / collect / old / books / clothes / help / poor / children / mountainous areas. 2. Rewrite the sentences with the same meaning. 1. This is the first time I have seen him. → I have never 2. I started studying English 3 years ago. → I have 3. I haven't seen him since I left school. → I last 4. It started raining two days ago. → It has 5. I have never seen such a beautiful girl before. → She is 6. We have never had such a cold winter. → It is 7. The last time she kissed me was 5 months ago. → She hasn't 8. It is a long time since we last met. → We haven't 9. When did you have it? → How long ? 10. She started driving 1 month ago. → She has 3. Make sentences using the words and phrases given. 1. ever/ you/ work/ volunteer/ done/ have/ ? 2. you/ volunteer/ do/ to/ become/ a/ want/ ? 3. for/ raise/ Ha Noi/ fund/ we/ poor children/ in/ homeless/. 4. children/ education/ we/ provide/ for/ disabled/. 5. the/ better/ world/ responsibility/ take/ volunteers/ of/ a/ making/. 6. do/ can/ you/ how/ we/ children/ elderly/ help/ think/ ?