A sound at the church's back caused them to look up.

The rattle of a wagon caused her to look up.

Just then a cold shadow fell upon my cheek, and caused me to look up.

Something in his voice caused her to look up into his face.

His brother's low, trembling voice caused Roberto to look up.

A commotion in the restaurant caused him to look up.

The way he said it caused Tillie to look up against her will.

Movement above his head causes him to look up.

An exclamation from the other caused him to look up.

Then something in the air caused him to look up.