我回想起我住在法国的时候。

I ___thought ___back to the time when I was living in France.

玛丽试图回想她上次从抽屉里拿走它的时候。

Mary tried to ___think ___back to when she had taken it last from the drawer.

当我回想我的童年时，我想起了许多快乐的时刻。

When I ___think ___back on my childhood, I remember many happy moments.