Dung dịch của chất X có pH >7 và khi tác dụng với dung dịch kali sunfat tạo ra chất không tan. Chất X là. A. BaCl2 B. NaOH C. Ba(OH)2 D. H2SO4.

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.