她正要离开时你打电话来了。

She ___was ___just ___about ___to leave when you called.

他没注意到自己差点踩到一条蛇。

He didn't notice he ___was ___just ___about ___to step on a snake.

我们马上就要开始会议了。

We ___are ___just ___about ___to start the meeting.