阅读下面短文，掌握其大意，然后从各题所给的四个选项中选出可以填入空白处的最佳选项。

There are four people in my family: my father, my mother, my sister and ___. My father is a doctor and my mother is a ___ in a middle school. They both work very hard every day. My sister is two years ___ than me and she is in Grade Nine now. We often help each other with our lessons. At weekends we like going to the park ___ having a picnic there. I love my family and I think it is the ___(5) family in the world.

【第5空】