Khi nhỏ vài giọt dung dịch muối đồng sunfat vào ống nghiệm đựng 1ml dung dích natri hiđroxit thì thấy có hiện tượng gì? Giải thích và viết PTHH (nếu có).

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.