1 Khi cho dung dịch HCl vào copper (II) oxide CuO thấy hiện tượng: 2 Hòa tan oxide A vào nước thu đựơc dung dịch có pH>7. A có thể là oxide nào? 3 ............ + H2SO4 ----> H2 + .............

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.