Cho sơ đồ sau: Cacbon → A1 → A2 → A3 → Ca(OH)2. Trong đó A1, A2, A3 lần lượt là: A . CO, CO2, CaCl2 . B. CO2, CaO, CaCl2. C. CO2, CaCO3 , CaO. D. CO2 , Ca(HCO3)2, CaCO3.

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.