Hoàn thành sơ đồ phản ứng sau (mỗi mũi tên ứng với một phương trình hóa học):

$$\begin{gathered} Na\stackrel{\left(1\right)}{\to }NaOH\stackrel{\left(2\right)}{\to }NaHC{O}_3\stackrel{\left(3\right)}{\to } \\ NaOH\stackrel{4}{\to }N{a}_{2}s{o}_4 \end{gathered}$$

Pháp luật quy định ntn về quyền tự do kinh doanh và nghĩa vụ đóng thuế

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.