你想进入老师的办公室，应该这样请求：
？
你想知道现在几点，可以这样问：
？
假如你是John，有人打电话找你，你接听时可以这样应答：
Hello! ．
你想要感谢对方的帮助，可以这样说：
for your help．
We should not use more water than we actually need． If we do， we will not have enough water in the future． （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． （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． （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．
（4） We can save lots of water by not letting taps（水龙头） run while we brush our teeth or by turning off taps right after washing hands． By collecting cold water when were taking warm showers， we can also save water． （5） In this way， we can make full use of water．
A． However， just how much is too much？
B． There are several things we can do to save water．
C． Finally， they make laws to control the use of water．
D． We don't have to let the cold water run until it gets warm．
E． They also increase water bills for people who use too much．