1.   Presumably to keep his mouth shut.

2.   It makes little sense, they argue, to keep houses shut when the convicted offenders are already free, especially with Israeli-Palestinian peace talks under way.

3.   One imagines him capable of the unspeakable, and then keeping his mouth shut about it.

4.   They are running, playing hard, and, so far, keeping their traps shut about minutes.

5.   You have no choice but to keep your mouth shut.