1/ Cho tam giác ABC vuông tại A có BC = a, AC = b, AB = c. Chọn khẳng định sai? A. b = a. sin B = a. cos C B. a = c. tan B = c. cot C C. a2 = b2 + c2 D. c = a. sin C = a. cos 2/Cho tam giác ABC vuông tại A có BC = a, AC = b, ABC = 50o . Chọn khẳng định đúng. A. b = c. sin 50o B. b = a. tan 50o C. b = c. cot 50o D. c = b. cot 50o

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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.

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We should decorate our living room with _____ orange banner. We also need ________  ribbons, balloons, party hats and costume.

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I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.