Do you know anything about water? You may say, "I 【小题1】water every day." When you look at the map of the 【小题2】, you can find there is more water than land. But the water in the 【小题3】is salty. We can't drink this salty water. There are also a lot of very small 【小题4】things in the sea. They live with fish and 【小题5】.