He was the only one who knew how to open the box!

He bit out the words, making no move to open the box.

At the end of the hour, but before we open the box, what has happened?

I rose at these words and went into the house to open my box.

He was the one who had to be there to open the box.

He sat down on the bed and opened the box.

And when he opened the box again she was gone.

Alone in the room, he sat at a long table and opened the box.

She turned to a small table and opened a box on it.

It won't work except the first time you open the box.