1.   Afraid to ask seemingly stupid questions, I kept my mouth shut.

2.   And if both prisoners keep their mouths shut, neither will be incarcerated.

3.   But I kept my big mouth shut.

4.   He shut his mouth and hung his head.

5.   If I would only keep my mouth shut more often, I thought, I would fit in better everywhere.

6.   If the radio operator kept his mouth shut, the transgression might not get to the ears of his superiors.

7.   If we can not help in the analysis of concrete problems, we should keep our mouths firmly shut.

8.   In the end, I kept my mouth shut.

9.   It was time, his friend and business adviser Robert Brown believed, for Tatum to keep his mouth shut.