there is a possibility that it will rain.中为什么用that而不用which 和if 和whether

英语翻译The current situation with chemical analysis in air quality control activities is characterized by a mismatch between the prospects opened by integration of semiconductor chemical sensors into analytical practice and the limited possibili Is there a window? There is a middle there is a cat there is a problem Is there a school Is there a house___? There is a Is there a. there is a There is a kitshen. There is a pair over is village a there there (.) There is a long r______ there. There( )(be)a football match,is there. there is a baby horse over there. there ,a there,is ,phone如何排列? where there is a life,there is a hope.