Why do we have save water?

Why do we have save water? why do we have economics models? we,save,do,how,water? Do you know why we have Father is day Why do we have rules and law 英文版答案 why do we have to learn Engling?作文 why do we have to learn englisg?是什么句子? why do we have examinatiom请用英语回答, WHY WE DO NOT HAVE THE RIGHT OF FREE SPEAKING! why do human beings live,why do we have to work tiredly. we have () water here,please save it We have to do something () water in daily life.A.saving B.to save C.saves D.to saving Why do you save your v_________ on your computer填空. We've done what we can to save the situation.Now we have nothing to do but wait.谁能给我把这句话讲讲. why do we study English why do we study English why should we do exercise? Why do we need friends?