1.Siêu âm cá voi 70.000-140.000 dao động/giây. Vậy 1p phát ra bao nhiêu dao động? 2. Tại sao cá voi nặng nề nhưng vẫn di chuyển dễ dàng?

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nhanh nhất mk vote cho 5 sao * Complete the second sentence so that it has similar meaning to the first. 1. I walk to school. I will help reduce air pollution. ( If) => If I………………………………………………………… 2. We have watched “Tom and Jerry” many times. We like the film so much. (because) => We……………………………………………………………… 3. I like football. I don’t like playing it. (but) => I …………………………………………………………………. 4. We tried our best. We didn’t win the game. (although) => We …………………………………………………………………….. * Complete these sentences, using given words or phrases 1. We/ visit / our grandparents/ the countryside / last Sunday. =>............................................................................................................................. 2. If / we / reduce / plastic bags / cans, / we/ help /environment. =>............................................................................................................................. 3. future / I / have / hi- tech robot/ to cook meals. =>............................................................................................................................. 4. Beaches / Nha Trang / be / most beautiful / Vietnam. =>.............................................................................................................................