Hai đường tròn đồng tâm có bán kính 10cm và 4cm. Bán kính của đường tiếp xúc cả hai đường tròn là bao nhiêu? A. 2cm B. 3cm C. 4cm D. 5cm Biết AB=9cm. Khi đó chu vi tam ADE bằng: A. 13,5cm B. 15cm C. 18cm D. 19,5cm

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.