Cân bằng các phương trình phản ứng sau theo phương pháp thăng bằng electron với mỗi phản ứng cho biết số oxi hóa chất khử Sự oxi hóa và sự khử a) KMnO4+KNO2+ H2SO4--> MnSO4+ KNO3 + K2SO4+ H2O b) NaCrO2+ Br2+NAOH-->NA2CRO4+NABR+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.

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.