阅读下面有关企鹅活动的周期表，在短文的空白处填入或选择恰当的词，完成对其活动的介绍。

The Penguin Calendar

    The chart above shows five activities of penguins over a period of one year, month by month. They are hole staying, nest building, , chick raising and moulting. The penguins stay in the  most of the year, from January to October. In July, they begin to build nests, just  (before/ after) they lay eggs. Chick raising lasts five months, from September to the next . After chicks come out of the eggs, they begin to lose their baby hair, which is called moulting. It usually takes about  months, from February to May.