Câu 7 : Phản ứng hoá học nào sau đây tạo ra oxit bazơ ? A. Nung nóng Cu(OH)2.                                   B. Cho dd NaOH phản ứng với dd H2SO4. C. Cho dd Ca(OH)2 phản ứng với SO2.             D. Cho dd Cu(OH)2 phản ứng với HCl .

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.