It is essential that mankind ------ ways and means to protec

It is essential that human____ ways and means to protect the It is suggested that some measures(should)be taken to protec It is essential that everyone ___ what to do. 翻译It is one of their ways to show that they grow up and they （it ）means that it is going to sonwtomorrow 对么? It is that that "that"means that that conntributs to that.怎么 “It is difficult to answer that question” means _______ . It is said that the earth is ( )if human begins don’t protec It reminds us that part of what it means to love God is to l It is essential that the program _________ into the computer it is essential that computer security professionals should（ AT shcool,it is essential that every child--equally regardle