keep a straight face in a sentence

Examples

1. Somehow, Sandoval is able to keep a straight face, which makes it even funnier.
2. Trying to keep a straight face posed a constant problem.
3. I can't understand how he could keep a straight face.
4. He keeps a straight face, something no one watching will be able to do.
5. It's hard for me to keep a straight face when they come in here.
6. Most of the people in the room are trying to keep a straight face.
7. Haynes and others sometimes failed to keep a straight face and occasionally burst into laughter.
8. The woman, trying to keep a straight face, nodded.
9. Dripping, bedraggled, shivering, she can hardly keep a straight face as another bucketful hits them.
10. Costner keeps a straight face through it all, though that probably wasn't the smartest approach.