她打电话来时，我正好想起了我的一位老同学。

I was just ___thinking about my old school friend when she called.

他常常想起在西班牙学习的时光。

He often ___thinks of his time studying in Spain.

我常常想起我的祖父母。我非常想念他们。

I often ___think of my grandparents. I miss them so much.