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The Oxford Dictionary is useful for you to learn English, so you'd better buy _____.
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在△ABC中,角A,B,C所对应的边分别为a,b,c,若实数λ,μ满足a+b=λc,ab=μc^2,则称数对(λ,μ)为△ABC的“Hold对”,现给出下列四个命题:
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She told us things there were ________ better than before.
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Halloween falls on October 31st. It is one of the most favourite holidays for children in the USA.
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