痰量较多、排痰困难、无力咳嗽的病人（）

A.体位引流

B.湿化呼吸道

C.拍背与胸壁震荡

D.机械吸痰

E.指导病人有效咳嗽、咳痰的方法

You can't predict everything. Often things don't _____ as you expect. [ ]

A. run out

B. break out

C. work out

D. put out