____we must do is___the use of energy.B.What ;t

____we must do is___the use of energy.B.What ;t What we must do is reduce the use of the energy ___we must do is___ the use of energy. what we can do to cut down the use of energy?什么意思 The little boy doesn't know manners ____we do.A.and B.what C People usually use s_ to show what you must and mustn't do what shall we do if we use up the energy in the world的同义句 英语翻译The very simplicity of this use of energy proves to us t What types of energy should we use:wood,coal,petroleum,water Don't use so much energy What use do you make _____the books?A.for B.about C.of D.wit What we need is___the animals.We mustn't wast time.