1. 最富有生气而又最重要的日子,就是告别冬天,迎来春天的日子.
   The most ______ and important festivals are the ______ that _______ the end of winter and
     the ______ spring.      
2. 一路向东行,你会经过一座座山脉,上千个湖泊、森林,还有宽阔河流和许多大城市.
    ______, you will pass mountains and ________lakes and forest, _______wide rivers and large cities.  
3. 他的眼睛盯着桌子上兄弟俩剩下的残羹剩饭.
    His eyes stare at _____ on the table.
4. 水对于生命的发展会起关键作用,这一点在当时并不明显.
    ______ water _______ fundamental to the development of life.