初中完型填空Youcannotsee(1)feelitwhenitisapartoftheair.Thewaterintheseas,riversandlakesisliquid(液体).Thewaterintheairisnotaliquid(2)agas.Cloudsaremadeofwater.Theymaybemadeofverysmalldropsofwater.w

　　初中完型填空

　　Youcannotsee(1)feelitwhenitisapartoftheair.Thewaterintheseas,riversandlakesisliquid(液体).Thewaterintheairisnotaliquid(2)agas.

　　Cloudsaremadeofwater.Theymaybemadeofverysmalldropsofwater.water,youhave(3),isveryuseful

　　1.A.andB.or

　　2.A.butB.andC.also

　　3.A.foundb.foundoutC.lookedforD.founded

　　请每题说明一下为什么.还有翻译一下最后句.