Câu 10: Ngày Nước thế giới được tổ chức vào ngày 22 tháng 3 hằng năm. Đây là ngày quốc tế tôn vinh tài nguyên nước. Ngày Nước thế giới năm 2017 đã đưa ra thông điệp “Tiết kiệm và tái ...........(1)……nước thải để tránh ……...(2)……. , cải thiện vòng tuần hoàn nước cho các sinh vật sống” . Em hãy viết từ còn thiếu xuống dưới cho đúng với ý nghĩa của thông điệp.

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Câu 8: Dùng xi măng, cát, sỏi (đá) trộn đều với nước ta được gì?