Trong các phản ứng sau phản ứng nào là phản ứng trao đổi ? a. CaCO3 -> CaO+CO2 b. 2Fe(OH)3 -> Fe2O3 + 3H2O c. CuCl2 + 2AgNO3 -> 2AgCl + Cu(NO3)2 d. Fe+2HCL -> FeCl2+H2

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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.