题目内容：

阅读下面的短文，根据所给首字母提示，用合适的单词填空。

Switzerland is a small c1.__ with high mountains,thick forests and blue lakes.Swiss people d2._ on its rich nature resource to live.In winter the sun is brilliant,but the air is cold.Visitors go to Switzerland for winter s3.__.They wear warm clothes and sunglasses.They go up the mountains in lifts and ski down.They also skate on icy lakes.Visitors go to Switzerland in the summer time,too.They can c4.__the mountain or walk in the forests.They can swim in the warm lakes or they can go  b5.__on them.People call Switzerland the playground of Europe.