His right hand had disappeared into a crack in the wall.

"How would you get the water from the stream into the crack?"

I went back down into the crack and studied it.

Then one hand slid into a crack in the rock, caught, and held.

The fingers of his right hand slid into a crack and held.

He ran his hands cautiously into the open crack and pulled.

Melody put her fingers into the crack between the wall and door.

"It was slipped into a crack beneath the front door."

But about four years ago, Todd got himself into a real crack with his grades.

He grunted and pulled to the right, into the crack.