FeS + A --> B(khí) +C B + CuSO4 ----->D(đen) +E B+F--->G(vàng,rắn)+H C+J(khí)-->L L + KI(Kali iotua) --->C+M+N

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.