cho các công thúc hóa học sau Na2O, CO2,SO3,NaOH,Ca(OH)2,Fe(OH)3,BaCl2 H2SO4,Na2CO3,HCl. chất nào là oxit axit,oxit bazơ, axit ,bazơ , muối gọi tên

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.