what things do we use energy for?

what shall we do if we use up the energy in the world的同义句 reasons for energy shortage what can we do to save energy in what we can do to cut down the use of energy?什么意思 What we must do is reduce the use of the energy What do we use these.for We use it for.造个句子 for,use,we,what,glass,do 连词成句 what do we use water for 是否还要加doing what often use water for do we连词成句 what do we use it for?we use it to study English. we use knives for cutting things. what do dolphins use to find things? ____we must do is___the use of energy.B.What ;t