giúp e vs ạ e cần gấp Phản ứng hóa học nào dưới đây là phản ứng trao đổi? A. 2Na + 2H2O ⎯→ 2NaOH + H2  B. BaO + H2O ⎯→ Ba(OH)2 C. Zn + H2SO4 ⎯→ ZnSO4 + H2  D. BaCl2 + H2SO4 ⎯→ BaSO4  + 2HCl

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I think you should buy _____  pack of mineral water instead. And you can also buy _____  snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______  cookies and soft candies.

Choose the best answer.

We should decorate our living room with _____ orange banner. We also need ________  ribbons, balloons, party hats and costume.

Choose the best answer.

I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.