英语填空题 （ ） corn do we need?( ) do we do next? ( ) salt do we

英语填空题 （ ） corn do we need?( ) do we do next? ( ) salt do we how much salt do we need what do we need? Everything we need to do ___(do) Why do we need sleep Why do we need friend of them do we need Why do we need soil? Why do we need friends? why do we need plants WHAT DO WE DO? 填空（句型转换）We need water to do many useful things.We need water