1.   The bag snapped open.

2.   He smiled, and her eyes snapped wide open in genuine astonishment.

3.   Then her eyes snapped wide open in amazement as the funky disco beat changed to a slow, sensual ballad.

4.   As she placed the briefcase on the conference table, the lock snapped open.

5.   His eyeglasses snap open at the point where the temple meets the lens frame so that the same lenses can be used in several different frames.

6.   His eyes snapped open.

7.   When the starting gates have snapped open, Zippy has lingered for crucial seconds, letting the other horses get a jump on him before he takes off.

8.   His ski binding appeared to snap open as he hit a bump.