题目内容：

I am a boy student in Grade Four.___51____. At school I have three good friends._52____.Xiao Jun is a girl. She is nine years old. She is in Class2, Grade 2. Her eyes are big. Her nose is small and her face is round. Look at the girl. ____53_____ Her mouth is small. She is Xiao Qun, Lei Zi’s sister. She and I are eleven and we are in the same class.____54___ He is short. ____55_____.He and Xiao Jun are in the same grade but in different classes.

从方框中所给的选项中选出能填入空白处的最佳选项，补全短文。

51.            52.            53.            54.            55.