1.   His mouth dropped open when he saw me standing in front of him, carrying a gun.

2.   And my mouth dropped open.

3.   And in the back left corner of the gallery, where relatives and friends of the victims sit as tightly as a group hug, mouths drop open.

4.   Her mouth dropped open in comic shock.

5.   Her jaw dropped open.

6.   He was brilliant and my mouth literally dropped open.

7.   It is more common while people are sleeping on the back, as the lower jaw tends to drop open.

8.   My mouth dropped open in disbelief.

9.   Of course, she did it perfectly, and their jaws just dropped open.

10.   Her mouth dropped open and tears sprang from her eyes when the marks showed she had won.