Dãy chất nào sau đây chỉ gồm các oxit bazơ? A. CuO, CaO, MgO, Na 2 O. B. CuO, CO, Mg, CaO . C. K 2 O, MnO, FeO, NO . D. CaO, CO 2 , K 2 O, Na 2 O.

Choose the best answer.

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.