We should not use more water than we actually need. If we do，we will not have enough water in the future. 【小题1】 It is not a difficult question to answer. If we remove more fresh water than nature replaces，we have taken too much.

Many cities run campaigns（运动）to get people to stop wasting water. They show them ways they can cut back on water use. 【小题2】What's more，they carry out programs that offer money to reduce water use. For example，they give people shower heads and toilets that use less water. 【小题3】

Another threat（威胁）to our water supply is pollution. When our sources of fresh water get polluted，we can no longer use this water. This also endangers（危及）the animals that depend on the water.

【小题4】We can save lots of water by not letting taps run while we brush our teeth or by turning off taps right after washing hands. By collecting cold when we're taking warm showers，we can also save water. 【小题5】In this way can make full use of water.