The winter in Beijing is very cold .这句话的主语是什么啊?

Who can tell me Does it snow in winter in Beijin? In winter,the weather g_____cold 在冬天in winter 还还是in the winter on the snowy winter 还是in the snowy winter during the winter holidays是否等于in the winter holidays the weather is cold （ ）.A,winter B,in winter C,at winter D,for winter the weather is cold ( ).A,winter B,in winter C,at winter D,for winter Leaves in the trees f___ in winter. 在冬天:A.in winter B.in the winter C.during winter D.during the winter是哪一个哦？ what's the weather like in winter? The most interesting thing in Winter holidayOK? What's the weather like in winter? How is the weather in winter? what'the weather like in winter是什么意思 The weather in winter is______[snow,snowy] They sleep in the winter是什么意思 Is the weather cold in winter I often play ( ) the snow in winter.