Hãy chọn chất thích hợp để điền vào chỗ ............... a) HCl + K2CO3 2 KCl + …. b) SO2 + …. Na2SO3 + H2O. c) ….. + Ba(OH)2 KOH + BaSO4. d) Fe(OH)3 …. + H2O. e) H2SO4 + K2CO3 K2SO4 + …. g) CO2 + …. CaCO3 + H2O. h)….. + Ba(OH)2 NaOH + BaSO4. i)Al(OH)3 …. + H2O.

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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.

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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.