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1. I made a lot of __grammatical : ngữ pháp , thuộc về văn phạm________ mistakes in my writing.
2. __Chemical : thuộc về hóa học________ waste has been dumped into this lake, so it's seriously polluted. ( Cả cụm chemical waste : chất thải hóa học )
3. If we want to reduce pollution, we have to make ___scientific : mang tính khoa học , thuộc về khoa học_______ changes in the way we live.