Câu 31: Dung dịch của chất X làm quì tím hóa đỏ và khi cho tác dụng với dung dịch bạc nitrat (AgNO3) tạo ra chất không tan (kết tủa). Chất X là: A. Ba(NO3)2 B. Mg(NO3)2 C. BaCl2 D. HCl

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.