填入下面空缺处的语句，最恰当的一项是（ ）贾母因要带着刘姥姥散闷，遂携了刘姥姥至山前树下盘桓了半晌，又说问她这是什么树，这是什么石，这是什么花。刘姥姥一一的领会，又向贾母道：“谁知城里不但人尊贵，连雀儿也是尊贵的。__________。”众人不解……刘姥姥道：“那廊上金架子上站的绿毛红嘴是鹦鹉哥儿，我是认得的。那笼子里是黑老鸽子，怎么又长出风头来，也会说话呢。”众人听了，又都笑将起来。

. Some birds fly_______________in winter and some stay in the north.

Oh, it’s you! I ______ you.— I’ve just had my hair cut

Jack is really a brave guy — So he is And we can’t admire his courage _____ [ ]

It’s quite late now, __________ Xiao Ming is still busy with his lessons.