28.Khi cho từ từ dd NạH cho đến dư vào ống nghiệm có chứa dd HCl và một mẩu giấy quỳ tím. Hiện tượng quan sát đc trong ống nghiệm là gì ?

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.