根据课文内容填空。

     1.________ are my friends. 2._________ Maomao; 3.________ nice. But she is a bit 4._________.

This is Ms Smart. 5.________ a nice teacher. This 6._______ Xiaoyong. 7.________ a clever boy. And

this is Parrot. It's a naughty bird.

Swing的顶层容器有：JApplet，JWindow，JDialog和【 】。