Câu 8: Chọn câu đúng. Công thức tính điện trở tương đương của đoạn mạch gồm hai điện trở mắc nối tiếp A. Rtđ = R1 + R2 B. 1 2 1 1 1 Rtđ R R = − C. 1 2 1 2 R R R R Rtđ + = D. 1 2 1 2 R

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.