Air is all round us．It is around us___ 31_ ___we walk and play．From the time we are born，air is around us on every side．When we sit down，it is around us．When we go to bed．air is 32 around us．We live 33 air． All living things 34 air．Living things cannot live 35 air．We can live without any water for 36 days，but we cannot live for more 37 a few minutes without air ．When we are working 38 running，we need more air．When we are asleep，we need less air We live in air but we cannot see it．We can only feel it．We can feel it when it is 39 ．  Moving air 40 wind． 小题1: A．if B．because C．when D．what 小题2: A．too B．also C．either D．yet 小题3: A．with B．by C．in D．around 小题4: A．need B．hope C．want D．1ike 小题5:A．have      B．have no    C，with       D．without 小题6: A．little B．a Iittle C．few D．a few 小题7: A．about B．over C．than D．then 小题8: A．or B．and C．so D．but 小题9: A．moving B．standing C．stopping D．sleeping 小题10: A．is 1ike B．1ikes C．calls D．is called