Bài này làm trong 5 phút thôi vì ít! B1: Fill the sentences with more, less or fewer. 1.February has ______ days than January. 2.Overpopulation is causing ______ problems than we can imagine. 3.Big cities suffer ______ pollution than the countryside. 4.A teacher needs ______ calories than a farmer. 5.A healthy child requires _____ care than a sick one

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