Not all water is drinkable because some of them is p__

Not all water is drinkable because some of them is p__ In some countries,it is not ____to drink the water because i in some countries,it is not( )to drink the water because it Because not all of them fulfill their obligation and impart But is plain tap water all that bad?Not at all.(这里能用of cours a glass of water is not e__for me because I‘m very thirsty. Some of them they do..but not all.中文是什么? All of them are not here means some of them are not here.这句的 either of them is /all of them are一样吗 He is ___ clever of them all. she is taller than all of them 改错：There is some bottles of water.