It has no (colour／coat)or  (sheep／shape)．It has no (smell／small)or (taste／paste)．We cannot see it，but we can (fell／feel)it．It is (anywhere／everywhere)．It is (important／import)to all people．It is also important to animals and (plants／plane)．We all(have／need)it to keep us alive．What is it? It is (air／hair)．

    Two young trees are standing at the top of a hill．Their names are Tim and Alan．One day，it's sunny and warm．Some birds are singing in the trees．The wind blows，and the trees are talking．“What do you want to be when you grow up?”asks Tim．“I'm not sure．I think I want to be a chair or a desk，”answers Alan，“Maybe I want to be a toy box．I like children．”“What do you want to be when you grow up?”asks Alan．“Me?”says Tim，“I just want to be a tree．I want to be a home for birds．I want to have many apples．And when it's sunny and hot，people and animals can stand under me．”

    We live on the Earth．The Earth was  ，but now some parts are dirty．Let's work together to keep the Earth pretty and healthy because the Earth is only home for all the living things．We should ．We should ．We also need water and trees．So we shouldn't  ．We should stop  ．