$\text{Để trung hoà 50g dung dịch $H_{2}$ $SO_{4}$ 19,6% cần vừa đủ 200 g dung dịch NaOH c% . Tính nồng độ % của đ NaOH đã dùng.}$

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.