1. Despite his hilarious joke, she managed to keep a straight face.
2. It's hard to keep a straight face when someone tells a really funny story.
3. The poker player had a perfect poker face, with a completely straight face.
4. Even though she was nervous, she tried to maintain a straight face during the interview.
5. He couldn't help but smile, even though he was trying to keep a straight face.
6. The comedian's act was so funny that it was impossible to keep a straight face.
7. She was known for her ability to deliver bad news with a straight face.
8. The teacher struggled to keep a straight face while the students played a prank on him.
9. His expression never changed, and he maintained a straight face throughout the entire meeting.
10. The actor's ability to deliver emotional lines with a straight face was truly impressive.