圣诞树上的小彩灯在黑暗中闪闪发光。

The little lights on the Christmas tree ___twinkle in the dark.

当奶奶讲起她年轻时的故事时，她的眼睛闪烁着快乐的光芒。

Grandma's eyes ___twinkled with joy as she told stories about her youth.